Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d45426a8ffb6f76…

MALICIOUS

PDF

73.6 KB Created: 2021-06-08 20:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 970fffd315eaaf26fe882485b83efbef SHA-1: e8fe8c2e0e23ea74a6fb975b943cf3e8b30216f1 SHA-256: 5d45426a8ffb6f76d7e6514f96ee563e73d1fc17e2bd1f6247880739aff91331
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/pbw?utm_term=present+and+past+perfect+continuous+tense
    • https://cdn-cms.f-static.net/uploads/4380863/normal_605d13cbcc73e.pdf
    • https://sukivafuxek.weebly.com/uploads/1/3/0/8/130874221/9597992.pdf
    • https://cdn-cms.f-static.net/uploads/4403141/normal_60bdf41d911a3.pdf
    • https://cdn-cms.f-static.net/uploads/4482625/normal_60b7d6d3416a3.pdf
    • https://cdn-cms.f-static.net/uploads/4386606/normal_601af54949b37.pdf
    • https://static.s123-cdn-static.com/uploads/4369772/normal_5ffaeb996713a.pdf
    • https://vutetubefot.weebly.com/uploads/1/3/4/4/134431977/lerad-semidijomelol-dikowa.pdf
    • https://static.s123-cdn-static.com/uploads/4451575/normal_5ffc64707b911.pdf
    • https://static.s123-cdn-static.com/uploads/4402250/normal_5fe2469f8731c.pdf
    • https://lemosipezo.weebly.com/uploads/1/3/5/3/135326275/9643098.pdf
    • https://cdn-cms.f-static.net/uploads/4413012/normal_606e4189705c2.pdf
    • https://xibupofuku.weebly.com/uploads/1/3/5/3/135306475/6702462.pdf
    • https://cdn-cms.f-static.net/uploads/4384150/normal_6021c4a2c71cc.pdf
    • https://cdn-cms.f-static.net/uploads/4492580/normal_603704c2c3264.pdf
    • https://tanavizone.weebly.com/uploads/1/3/4/7/134709943/5020916.pdf
    • https://cdn-cms.f-static.net/uploads/4420240/normal_601fa833bcc87.pdf
    • https://cdn-cms.f-static.net/uploads/4459166/normal_6052eb62622b7.pdf
    • https://cdn-cms.f-static.net/uploads/4379959/normal_600f47e145964.pdf
    • https://kaxagigunuji.weebly.com/uploads/1/3/1/3/131383746/jaguxigelezibapivo.pdf
    • https://cdn-cms.f-static.net/uploads/4387716/normal_602fc3b95c230.pdf
    • https://difomojixi.weebly.com/uploads/1/3/4/3/134319012/guzowefu-pujubo-kofetunaduxib-rilome.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5b983e0c-bcd0-4608-a70f-776f22098954/kolalubarixogerukide.pdf
    • https://uploads.strikinglycdn.com/files/89c4c87e-32d8-44e0-8379-6219f580db49/74504347259.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_off0000e203.bin
845b176803fb4ed98e261fc6278b24967d03f124d41c8f6c01d9037644441b65
pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 5116 bytes
font_01_sfnt_off0000f380.bin
6ecdfb5fe56a104334023c2af4b2eb5db6bce0e2fddb88ac2ed9c1f73da57242
pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 10864 bytes