Malicious PDF — malware analysis report

Static analysis result for SHA-256 daed360dd20dfb63…

MALICIOUS

PDF

85.3 KB Created: 2021-05-14 13:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 324f5203408617c97b1fee7cd1a8b997 SHA-1: bed23daf7b2363ff80948ba4816ede27b64a85e9 SHA-256: daed360dd20dfb638f1d9258161c0f70a2659797d3208a037acf6385809af937
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a link farm. Several URLs point to disposable hosting and are associated with SEO manipulation tactics. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=the+complete+manual+of+suicide+pdf+chomikuj PDF link annotation
    • https://simepatu.weebly.com/uploads/1/3/4/2/134267103/gesamibujozafidavaj.pdfIn PDF document text
    • http://devlp.design/br_style_casheqyvh.pdfIn PDF document text
    • https://lomapasaxanigef.weebly.com/uploads/1/3/1/1/131164081/jinupofo-tijolines-namomoditevo-jinovubegesiz.pdfIn PDF document text
    • http://baltika-trans.com/wahl_clipper_charging_cablepfp2q.pdfIn PDF document text
    • https://mufosuxid.weebly.com/uploads/1/3/4/0/134040625/terepez.pdfIn PDF document text
    • https://bipekafus.weebly.com/uploads/1/3/0/7/130776646/413be98106bb23.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/vuwixakirapa.pdfIn PDF document text
    • https://fuxovibafisiboj.weebly.com/uploads/1/3/0/8/130874455/bibegidomazozo.pdfIn PDF document text
    • https://xivilikowigonun.weebly.com/uploads/1/3/0/8/130813923/97108c33e7bf6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_4b91f6a2efee413fb97217e2e3f8f9ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/fake_cheque_template_uk.pdfIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_d55609ae017b4e2f9a13712014bf4ecf.pdf?index=trueIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_3230667c453a46e5be0f4b29b35f0b73.pdf?index=trueIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_5bbaa384098849d9aadb873d2e43de9c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tevigotu/brain_rules_john_medina_free_download.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_75478cb846ed44ae9168eccb99d425e9.pdf?index=trueIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_df6d4b8a09e1444bb6edd4134a0540f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/62941533502.pdfIn PDF document text
    • https://7dad073a-5858-4d13-bf35-a645d3acb044.filesusr.com/ugd/71e439_910acf255fc84a03b102bdd577e907c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/love_test_calculator_game.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_d6ef859ba17342f59a442ad5a32108ca.pdf?index=trueIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_e3a2d84848914578967bb6b6bb0bf410.pdf?index=trueIn PDF document text
    • https://aaca6425-83b8-4992-a49d-2ec8a2d61848.filesusr.com/ugd/304e3c_c2da81d755624e0e9f25d1dd3844423d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 5388 bytes
SHA-256: 15bfa477bdaf2181fdb969657c2141353f922d5b4d5a84f2ef873206cf36729e
font_01_sfnt_off00010b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0A 11352 bytes
SHA-256: c24b090a0a440c1cc37416f48f654b0138cec2f2034526cc026f9bf766a65e02
font_02_sfnt_off000130c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C3 16084 bytes
SHA-256: ce90dcb8f80a691a226d66d7b9fb40db13b52946125f6d312f8860abae454107

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