Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a5c5966d50a7b5…

MALICIOUS

PDF

82.5 KB Created: 2021-03-29 10:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 310628275b764d33cc8725a2f84f3010 SHA-1: 81cc9eb7eaac3baa5f768fbef5e1ca956427a9ee SHA-256: 45a5c5966d50a7b5faa952bc0ec71525ee3b4d28484f72760c5871872bce3ba4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, with one prominent URL being `https://kuzutuzo.ru/123?utm_term=savan+addy+nagar+song++mp4`. The document body appears to be malformed or obfuscated, but the presence of external links and the heuristic findings strongly suggest an attempt to redirect users to potentially harmful websites, possibly for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/123?utm_term=savan+addy+nagar+song++mp4 PDF link annotation
    • https://cdn.sqhk.co/natokaze/Yctjia1/how_do_i_unlock_my_usaa_card.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/ijggzij/ice_age_adventures_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/samojusive/fhNhegj/black_panther_mask_for_kids.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/Yidxjiy/all_pickaxe_enchantments_minecraft_1._14.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/Ohigdgf/93651414682.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_ebdcb57277684361910ffda6f421e5a9.pdf?index=trueIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_004830d73c2d450ea40c3f03813080d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bc350d-3f47-4fc8-9f82-496780dbefa3/88125223924.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/circular_flow_of_economic_activity_worksheet_answers.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_e847f62eaedb4630b64d7ca30be70b98.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72cb8037-c034-4e42-aad3-3b248fc3dba5/line6_amplifi_tt_app.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_c3d7e3b58be54db6bf9af61be0b96a15.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e60a3f-7eca-484f-855d-fc3b78a45524/jenovez.pdfIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_937216a4f592484587d76c8138156eb0.pdf?index=trueIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_53ec924b3d344631983cb448302b9f6d.pdf?index=trueIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_20aeddab8d2f4dfda1bd3b09d0a0561f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/fujanoziwijepirugawabeten.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_4943d824a99f4535b94bda211b2361fd.pdf?index=trueIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_e9c4d0c8642b42a698a717b3853737d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivala/tegavotinasesagezatixupuv.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/40543710467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5ee64f-7e53-43f8-a9e2-a1346d38035f/what_are_the_different_levels_of_krav_maga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc4f0760-23a8-4c92-ae23-bc6474ebf0df/ruger_lcp_pocket_holster_wallet.pdfIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_c4cf5142580f4b28b53ff4753951d0e7.pdf?index=trueIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_66cff4cff8ef417789b20c6d3b069fe7.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 5140 bytes
SHA-256: ce0480128de8ee0da3c13fcc8fcef9aa20aaae662589339c8588bb7ddd267749
font_01_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 11096 bytes
SHA-256: 37a7b9fc2fb57c5f208f1f3a90a9c18259970809c85332a5d6ccfe55c5a53a40
font_02_sfnt_off000116ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 16096 bytes
SHA-256: 2dff1fc3e5bf1049a512ca2ab3d4448021a5e4676c0c9a63fbc3d390c83797d9
font_03_sfnt_off00012b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B91 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230