Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e7a85cdfb39432…

MALICIOUS

PDF

72.1 KB Created: 2021-03-19 16:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f184fdf161d1294c107f27a94d1183c9 SHA-1: 5cd5a61c0f480abd2699644aa22e704ae2121b8d SHA-256: 89e7a85cdfb394320ee7e0f086b3f97add86a648cfd3a9557b7484001737d0e5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=the+crucible+act+1+open+book+test+answers PDF link annotation
    • http://sallehq.xyz/manualidades_de_reciclaje7iqm6.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/fzEfeii/92774152855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446642/normal_604b38abd9765.pdfIn PDF document text
    • http://indohealth365.online/955057672451cy3u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_6012b0d14d0c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_5fd65b05c8a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_601e67ca37790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409103/normal_5fe98753716fc.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/uwnif0H/ark_wyvern_egg_command.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484355/normal_60118ab7dc4a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5ff180af43aa8.pdfIn PDF document text
    • http://50offit.pro/polaris_ranger_570_midsize_manual5t30g.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://uploads.strikinglycdn.com/files/2c4fb039-cf12-41cd-aa45-ebb2b1ab51ed/dinufegidovipezipa.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_77ba94c7d33643d98ae4343f781b6344.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae9c569-122b-4086-bd30-f7f297bdfb83/21012682139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/654c9893-57db-442d-ab30-f709d7e67c16/xavuwovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd645f3-e380-4e08-b788-f15160aaad46/wuzinat.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_9ab734a7476d4ef0a89586d47c1fd25f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd77feeb-2dd5-4c6c-be48-4234d7a855e2/somuxebanisorulowakefiwan.pdfIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_ec8434a1ecd84939b8ac745199838452.pdf?index=trueIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_a36c476d26634d48a0a45545a3b31a17.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 5200 bytes
SHA-256: a24866fed5e4741bb97dbf34f1a1ddbea602ba19b9013631d2fdeb0f4e5a898c
font_01_sfnt_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 10128 bytes
SHA-256: c9f40e258a1aa5f6f4e2004319ee8229a3c720d24d6ce001251270b7e4933059
font_02_sfnt_off000104b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3