Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b641293a171a32f…

MALICIOUS

PDF

84.1 KB Created: 2021-04-14 08:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 490581edb1e62b03dd8a0f40bc8fa8cc SHA-1: 11146dc247e54e91120857094583e6713107037f SHA-256: 7b641293a171a32f2e87fc041b345e389a32286a6bcbf3631d1e20ce8cad7f04
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=what+are+text+structures+in+english PDF link annotation
    • http://vbnmcxz.xyz/costco_trane_air_conditioner6d8pu.pdfIn PDF document text
    • http://torchland.xyz/what_is_the_standard_enthalpy_change_for_the_dehydration_of_2-methylpropene833xi.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/ggeQjbo/mowip.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/gjjX5gf/62978366717.pdfIn PDF document text
    • https://cdn.sqhk.co/joninopi/wgcjaQ5/knife_smash_hit.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/Fii7jdE/komebi.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/g38jcdx/65561166423.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/jsBTWQ6/matrix_live_wallpaper_pc.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/113393523.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/ibjjhfF/81652461994.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/naligibarubuvopatejilim.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/ihNie06/music_with_lyrics_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e293223-34dd-4195-9ba3-dce747aae475/how_does_symbolic_interactionism_explain_deviance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b65d64-c5b0-49d5-88f0-999cb8a71c01/xbox_360_wireless_controller_for_pc_without_adapter.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_5cba786b68444f039592da5fc2e46e3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/298ef623-d1f3-4b75-90a7-9c309c2ee12d/65703096968.pdfIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_06788604d17c486bb4fd279165e81894.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abfb2942-8eab-48e3-8ab2-4918708e59b5/how_to_check_your_computer_specs_for_gaming.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 5144 bytes
SHA-256: 9d44c02286a540ce30e2b6a27a657982251eb63f9eeab1763717c64230891bca
font_01_sfnt_off00011d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 11108 bytes
SHA-256: d3c57ebe80b4d8499424543d6bea17b75a378ef9efe75fdc8ce02f8124f56697

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