Malicious PDF — malware analysis report

Static analysis result for SHA-256 d611ae00593c3e35…

MALICIOUS

PDF

86.0 KB Created: 2021-02-22 10:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dff229392e77e4f1df76fdc9c4aab32b SHA-1: 90c8927f60e25b2fcde37ec480069450610d178e SHA-256: d611ae00593c3e35ccf87507b81e7eaa8b8110cc4192b138cfa19ec4bdab5def
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation or credential harvesting.

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://jottigo.ru/wix?keyword=acer+aspire+one+nav50+user+manual PDF link annotation
    • http://netewe9.xyz/15660675639hzoex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387825/normal_5ff8f5e647e5c.pdfIn PDF document text
    • http://workshop-fb.ru/42195104383jp19x.pdfIn PDF document text
    • http://grigolia-studio.ru/how_to_make_worksheet_read_onlyms082.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/7f0ed83.pdfIn PDF document text
    • https://tewamuwomipatus.weebly.com/uploads/1/3/0/9/130969874/199421111.pdfIn PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/divixezerux.pdfIn PDF document text
    • http://hurricane1.space/spirit_halloween_jobs_indeed9er3a.pdfIn PDF document text
    • http://shoop-fg.ru/conditional_probability_independent_practice_worksheet_answersscyxc.pdfIn PDF document text
    • https://sobopagugakevul.weebly.com/uploads/1/3/4/8/134881985/dofuzatipoxen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457332/normal_60174b631e3db.pdfIn PDF document text
    • https://metogixum.weebly.com/uploads/1/3/0/7/130775033/9885705.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473890/normal_5ffb2781e6520.pdfIn PDF document text
    • https://fuwofinirofen.weebly.com/uploads/1/3/1/6/131637723/suwunedix.pdfIn PDF document text
    • http://redtea.space/kazowuxoparakinuvuvu3g8jc.pdfIn PDF document text
    • https://wawogikaso.weebly.com/uploads/1/3/4/7/134726687/sipuzewumepewanome.pdfIn PDF document text
    • http://redita.fun/blue_iris_apple_homekitkkq0n.pdfIn PDF document text
    • https://xenuwupe.weebly.com/uploads/1/3/5/3/135329542/vewonos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AF 5396 bytes
SHA-256: 6992e83a9172626769fc71a36aa3eb1ac109a2f28e117cc2c6563fe99bb18393
font_01_sfnt_off000125fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 10728 bytes
SHA-256: 4fcb89b428bc6ab3c4596789faf0dcc9f51ec69f9ad035b0bb0b4ec4178ea8b7

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