Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b6b7cd50d46937…

MALICIOUS

PDF

79.1 KB Created: 2020-12-08 15:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 93c10fa9d7f9731287a7e4370527cfd6 SHA-1: eab299b5ae0087cbd30130f0c2e05e238efcb3c7 SHA-256: 08b6b7cd50d469377a5058706be08773c3f2e6891aace68ed6bea67609056b3e
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. It contains numerous external links, including one pointing to "https://traffnew.ru/strik?utm_term=sat+math+1+cheat+sheet", suggesting a phishing or SEO spam campaign. The document body is heavily obfuscated and unreadable, but the presence of external links and the PDF_SEO_LINK_FARM heuristic indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/strik?utm_term=sat+math+1+cheat+sheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419410/normal_5fc74ade605c9.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/578063.pdfIn PDF document text
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/gitunexaximijefododu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412909/normal_5fb8a559241b3.pdfIn PDF document text
    • https://xemamipu.weebly.com/uploads/1/3/0/8/130813095/99f26.pdfIn PDF document text
    • https://widijozitumude.weebly.com/uploads/1/3/4/6/134688085/gemawo_tubed_pinexopududezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5f891bb21bc49.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/gelawiweza/sakifutaludigivexivib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89504c82-b3b7-4419-a79b-b8bab2cab4b5/labereludukadefifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c3993b-856d-4753-93f9-1789e72fac85/57130986114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3601763-fd93-4163-99c6-659f5f9e2b2c/85081000244.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/e_depot_04062.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/martyrs_day_uae_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578d4328-c854-4fbe-af21-54b0aae0c81e/the_richest_man_in_babylon.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_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 5068 bytes
SHA-256: 12c8b37a6671eb15f1c028fc0fd9c89ede6c1318553bc42d360357609d33f62d
font_01_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 12004 bytes
SHA-256: 0641dcf7581458574f46bf83074599dbbf835b79feb78649808bb9b380810b77

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