Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d4fa1cf056a926…

MALICIOUS

PDF

75.0 KB Created: 2021-02-20 13:29:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e2124949aef050ef0502376c17812503 SHA-1: b3ae19ac8a59c526578b9779e0e106f1f80834db SHA-256: c8d4fa1cf056a9260e0d591ee53c043c46d992850dea7236a14774cdba3e8544
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, pointing towards potential SEO manipulation or distribution of further malicious content. No scripts were extracted, but the overall structure and heuristics strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/wix?keyword=regla+del+baloncesto+3 PDF link annotation
    • http://lastmarkt.ru/conversion_de_mm_a_pulgadas_en_pvck2zrm.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/5hjhcjd/77891057015.pdfIn PDF document text
    • http://lewulumotuf.iblogger.org/novodisojepivew.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzememub/c1lBajd/new_puzzle_game_for_toddlers_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nigulavax/hh1iagj/battle_buddy_tarkov_android.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/hhtHiio/flip_phone_at_t_prepaid.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/h1ZIjcG/mapidokabalurid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_60014c3c4c5a6.pdfIn PDF document text
    • https://wafumaxa.weebly.com/uploads/1/3/5/4/135400811/2383528.pdfIn PDF document text
    • https://cdn.sqhk.co/jemowevu/doAjjhh/11218898389.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471948/normal_5fdf827f32d69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490515/normal_60033c79462b8.pdfIn PDF document text
    • http://pr-bux.online/bowajandemiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zebofazedixa.rf.gd/14019328852.pdfIn PDF document text
    • http://zivobojunoloma.epizy.com/zepevege.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_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 5324 bytes
SHA-256: 53c202829eb92d77805fe72bfdade4f81b95e0f7bb19115811cd5a0a4119fbef
font_01_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 11348 bytes
SHA-256: d6fd924209ddcb7edf8665bb290a59329c148908d8569d27fc1dbb3a55944837

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