Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fc74531e0652ce…

MALICIOUS

PDF

89.4 KB Created: 2021-04-14 06:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bbddef1166b358ccce348365f9a89acc SHA-1: 9fcb0dd4ae035d02b8a6c7303b704c787834984c SHA-256: 81fc74531e0652ce2455a843841e5fac7fc6c74a3be13f221504008ca6250da7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though partially corrupted, contains a query about calories, which may be a lure to disguise the malicious nature of the links.

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://mezovuduw.ru/strik?utm_term=how+many+calories+are+in+a+soft+shell+taco PDF link annotation
    • http://rankingcoach-apps.com/5239785251cvq3o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_6033712d903aa.pdfIn PDF document text
    • https://xunowivoratidom.weebly.com/uploads/1/3/1/6/131636824/cefe4.pdfIn PDF document text
    • https://rupokolox.weebly.com/uploads/1/3/0/8/130813141/tikegigaso.pdfIn PDF document text
    • http://stonersfranchise.com/9097053356bonjo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490528/normal_5fd71fa9d791e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_602c902ced197.pdfIn PDF document text
    • https://mikuloxituxawe.weebly.com/uploads/1/3/1/4/131410747/6051668.pdfIn PDF document text
    • http://retilokufiz.22web.org/44644408087.pdfIn PDF document text
    • https://susetizumuru.weebly.com/uploads/1/3/4/4/134461935/soneluzut.pdfIn PDF document text
    • https://pajodiwid.weebly.com/uploads/1/3/0/9/130968992/lilevobof-wudujazavi-wafisekozuforut.pdfIn PDF document text
    • https://debexubomes.weebly.com/uploads/1/3/4/8/134881130/waderanalaga.pdfIn PDF document text
    • https://deperomider.weebly.com/uploads/1/3/4/3/134344929/guluwuzunawos-tuxume-wofipug-texufadoxa.pdfIn PDF document text
    • https://simakaxulov.weebly.com/uploads/1/3/0/7/130738785/ca627d6cc8a8.pdfIn PDF document text
    • https://samituvejasuw.weebly.com/uploads/1/3/1/4/131406365/5218584.pdfIn PDF document text
    • http://policyhelpcenter.com/21111199433u2mno.pdfIn PDF document text
    • http://the-english-temple.com/word_slices_daily_puzzle_answersem9rj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fezenur/muregedoduroruden.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/rariwiwetezuboxelalide.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/the_little_prince_opera_synopsis.pdfIn PDF document text
    • http://wufejupixixot.epizy.com/81169578536.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/guxosoxigixasuduzela.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC7 5276 bytes
SHA-256: 4df6c8272a4a318ba8be24ab35d8d80aabc4f0440d572a061b43f0c1d0ac3deb
font_01_sfnt_off00012d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9C 12588 bytes
SHA-256: 032b61361c2ef3d4c3319f87310017769fdac97b6875fe7a32c0d23c3aedab64

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