Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eba1a331262b853…

MALICIOUS

PDF

67.3 KB Created: 2020-11-25 21:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 56b6a401fa4d97d3bdb2dd187778f3f9 SHA-1: 185a4601ce095f3d744ff2d7e812edd2c40d88a2 SHA-256: 0eba1a331262b85329669a3b2a0888566b4bccbf20853358f5bae446f1889518
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a "PDF_SEO_LINK_FARM". The primary URL, trafftec.ru, is suspicious and likely part of a phishing or malicious redirection scheme. ClamAV also detected it as Pdf.Phishing.Trojan, further supporting a malicious classification. No scripts were extracted, but the structure and embedded links indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=change+of+base+formula+proof PDF link annotation
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/06433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370530/normal_5f8ae72cc3b65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5fbbdd8930447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_5faf8d1e66c56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5fa54adbe1a06.pdfIn PDF document text
    • https://jubuxazule.weebly.com/uploads/1/3/4/5/134585976/zapilidojewofosume.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/newopetusam/lepidinokovosap.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/zizawisatamikoje.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/howard_university_admission_requirements_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/220be30e-e434-4c8c-889b-e90cbd0e6350/13631787783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e946d9c-965d-4877-94ce-7e9203d37a87/nuseke.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/fgo_summer_event_2019_farming_guide.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_off0000c9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D2 5360 bytes
SHA-256: a29482031950db41bd7c0a836c0f7623331d2b77abe094fd1ba8340bdbce5c3f
font_01_sfnt_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 10820 bytes
SHA-256: 3b721275525ba899aa643f78de88196540b2b29d092fcbf8b78cab7b60c75015

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