Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea4d6a66fded16d…

MALICIOUS

PDF

89.8 KB Created: 2020-12-06 19:27:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 21e110fc21550700c7efe9f4280df67c SHA-1: 70068a2aad2f49c0a4abd1d78ec30a37a2751370 SHA-256: 9ea4d6a66fded16d85316832e6ab8aa956e17ce4d41a97ee03b6fce3ea24e274
244 Risk Score

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and ClamAV also detects it as a phishing trojan. It contains a link farm with numerous external PDF links, including one that leads to known malicious redirector infrastructure. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its intended lure, but the presence of a malicious redirector suggests a phishing or scam attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=1991+topps+baseball+cards+checklist In PDF document text
    • https://musazowoxagaw.weebly.com/uploads/1/3/4/3/134323980/6562966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f9011a55b7f5.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/c39e045da87e.pdfIn PDF document text
    • https://tefaxupafovox.weebly.com/uploads/1/3/4/8/134855259/3175791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5fad511ccf3a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5fb8cfb9eb542.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/9860507.pdfIn PDF document text
    • https://navaraze.weebly.com/uploads/1/3/4/6/134682655/sunovurakise_dawesug_tuborokavaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5fafade5aecd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_5f9805ff59a9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5fa2a45516ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5f88cb87a67f3.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/nuruvapozixix/46667956661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4e4247-90fa-4c87-ad5f-6a420645d5f2/kidufebel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e71b34d-a912-4870-b368-383773fb8609/need_for_speed_most_wanted_android_requirements.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_off0001199e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 5476 bytes
SHA-256: 2bdb99f264f18d0fe478467adfa14601d0ebcbd5b04649ab77299125382538d5
font_01_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 13964 bytes
SHA-256: 4928bbd143bacbb456b2af8f82c18870615fbbd710b59be2e5779061866ebffe

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