Malicious PDF — malware analysis report

Static analysis result for SHA-256 400954b69958efd8…

MALICIOUS

PDF

76.1 KB Created: 2021-03-19 18:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87d5b5255ed2c22992ce1b1def89cab3 SHA-1: d2c6d8c84c38260fbfcf8fc84e62e72f9ffad5b2 SHA-256: 400954b69958efd8bdfcf2b61ad6404b7baf47f0309388dd4628b2368c7366d1
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are hosted on dynamic DNS services or free hosting platforms, suggesting a link farm or phishing infrastructure. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a keyword search, aligning with the PDF_URI and PDF_SEO_LINK_FARM heuristics that point to external malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/wix?keyword=guess+the+pic+word+game+answers
    • https://koverirenupoma.weebly.com/uploads/1/3/4/7/134747520/bulobedevi.pdf
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/boxikisafo.pdf
    • https://cdn-cms.f-static.net/uploads/4465941/normal_601be124d5549.pdf
    • https://cdn-cms.f-static.net/uploads/4458150/normal_5fd11c2cd1c2c.pdf
    • https://static.s123-cdn-static.com/uploads/4386609/normal_5fcdae087117e.pdf
    • https://cdn-cms.f-static.net/uploads/4481675/normal_5fd6ac1fd065d.pdf
    • http://zesenadozefut.sportsontheweb.net/family_budget_planner.pdf
    • http://pibarulajido.getenjoyment.net/merge_with_adobe_reader_x.pdf
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/a6b524bfd3.pdf
    • http://zokidinodajives.getenjoyment.net/lutukile.pdf
    • https://cdn-cms.f-static.net/uploads/4445880/normal_603fadc585680.pdf
    • http://badge-verification-center.com/70682542687694mw.pdf
    • https://jotafeke.weebly.com/uploads/1/3/4/0/134096025/1a61fa.pdf
    • https://cdn-cms.f-static.net/uploads/4427538/normal_602ebd27ebfa1.pdf
    • https://static.s123-cdn-static.com/uploads/4449998/normal_60053b3473c53.pdf
    • http://ridunculus.com/flip_phone_smartphone_3_screensgmm7x.pdf
    • http://mstmail.space/21732173498dim9o.pdf
    • https://cdn-cms.f-static.net/uploads/4392193/normal_60526cf3bd411.pdf
    • https://cdn-cms.f-static.net/uploads/4410190/normal_6027e3bf4ac0a.pdf
    • http://best-ital.fun/derogepujupilubowudoturoplz27w.pdf
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fcdc118a474c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gudukupir/bevipuxasitedi.pdf
    • https://s3.amazonaws.com/patotale/bekotafejuxomav.pdf
    • http://fazobelo.onlinewebshop.net/quadratic_equation_solver_online.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_off0000e9ed.bin
715452801d599896fbb693e49b7de84b70cbf9fad82542a1fd7f1a7b39cc65d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 5580 bytes
font_01_sfnt_off0000fccd.bin
9acff9b2fd56b96e0440d2ebf985fa8daae2fe2e18054663513b859e34169fe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 11500 bytes

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