Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ec2ee404a68235…

MALICIOUS

PDF

73.0 KB Created: 2021-02-10 05:23:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cb3c7a806e736f053e5f94ff4ac800c9 SHA-1: 874a079dda6aeea2bf8cdce980b749fe38be43f2 SHA-256: c1ec2ee404a682356cb0921be087ab1158ecc9c78911707c92a51e7c9a3e291b
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malicious content distribution scheme, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=getihu+power+bank+bg-140 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485927/normal_6000b46ebe904.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372696/normal_6004e3533344a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457876/normal_5fcf0c6de0296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_5fdc700443c25.pdfIn PDF document text
    • https://lelusujizuzu.weebly.com/uploads/1/3/1/4/131438438/lovodikizilis.pdfIn PDF document text
    • http://sevelorovuwo.66ghz.com/performance_guarantee_insurance_meaning.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/bodidiwowuzul-xedij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_601f57c74e099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_60131a847bb2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485442/normal_5ff63747659d8.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/5430801.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/0UVvfgh/sculpture_falls_texas.pdfIn PDF document text
    • https://pexerewiku.weebly.com/uploads/1/3/5/3/135313352/3fdab79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keximatefabuzi.rf.gd/levigomuzonefuzases.pdfIn PDF document text
    • http://kavunuses.epizy.com/uc_browser_hd_themes.pdfIn PDF document text
    • http://labireninofut.epizy.com/css_code_formatter.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_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 5512 bytes
SHA-256: 0b93864d8ce51ea09cc478b0fda2ac50791e4ab0bbe9047fb93652b8d434301f
font_01_sfnt_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 11060 bytes
SHA-256: 0bb1a81ae3d35f5fec89c978914999dd682ba491a1696d5f1cc9207f34ef93e5

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