Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b5612645c6180d…

MALICIOUS

PDF

108.2 KB Created: 2021-03-29 05:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 564698b308df2abc03d753a9251d75e8 SHA-1: 12ee1774eb8742a73158e51ab5961941285eea0e SHA-256: 79b5612645c6180d89929f5fcf91026f9476448308bbf06ea4b1c158be356901
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and exhibits characteristics of a link farm, containing numerous external links. One prominent heuristic identified a 'mass external PDF link farm' with 30 links, including the suspicious URL http://hookup756.fun/what_are_the_top_brands_of_bourbons2ust.pdf. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=f1+car+racing+games++for+pc
    • http://hookup756.fun/what_are_the_top_brands_of_bourbons2ust.pdf
    • https://cdn-cms.f-static.net/uploads/4387590/normal_605ba7ad3be9c.pdf
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/2314492.pdf
    • https://cdn-cms.f-static.net/uploads/4368955/normal_60464845c9d17.pdf
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/19896495e.pdf
    • https://static.s123-cdn-static.com/uploads/4392195/normal_5ff0960923807.pdf
    • http://acupofjacob.com/28924127253d7u2d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/netinuwa/widikuxemewevuwija.pdf
    • https://s3.amazonaws.com/libowebujakux/64300158207.pdf
    • https://uploads.strikinglycdn.com/files/2b9e9dc1-3fb2-4330-b889-53a5f75380a6/traditionalist_vs_modernist.pdf
    • https://uploads.strikinglycdn.com/files/409c7751-2b82-40f7-9ca8-48b987241742/dd_3.5_stormwrack_classes.pdf
    • https://s3.amazonaws.com/wanasuvedigo/togekizuketijo.pdf
    • https://s3.amazonaws.com/wofaxil/the_entertainer_piano_sheet_music_easy_free.pdf
    • https://s3.amazonaws.com/zerejibixupav/90652184366.pdf
    • https://s3.amazonaws.com/zoxewudunigus/jatazosekupowuxetad.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/aashiqui_2_bhojpuri_movie.pdf
    • https://uploads.strikinglycdn.com/files/6b362505-dce3-42e7-a9fa-d3da3dab9562/formulas_trigonometricas_derivadas_e_integrales.pdf
    • https://uploads.strikinglycdn.com/files/c4106314-096a-4888-b9e6-7cf170e0b4b9/xemepaxededore.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016b75.bin
ca9b26552af977c40d4ff65414e3d7a90881bfe6ba3b4638f40e16e62896b3cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B75 5308 bytes
font_01_sfnt_off00017d80.bin
4168296d035f1eced8d3df5ec8765c09569fb07077af03ed528ee805be7773e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D80 11360 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.