Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7d5b74dc07978f…

MALICIOUS

PDF

93.9 KB Created: 2020-12-21 06:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: af3200a450a67ee55d79630b18a237b7 SHA-1: 027968fbe2db50bd8a55b1c714238702eba32f21 SHA-256: ab7d5b74dc07978fd9f89a1a63756ff59d46138b1f999bf7a13934ac5712995a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the sheer volume of suspicious URLs points to a malicious distribution mechanism.

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://traffnew.ru/123?utm_term=martin+luther+commentary+on+romans+pdf PDF link annotation
    • https://xemupawiked.weebly.com/uploads/1/3/4/3/134321325/9260184.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/lidofanivadefew_pojidezojok_kifutubopu_lexafev.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/beb0250fb1b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f91d70b39bff.pdfIn PDF document text
    • https://vujanakisa.weebly.com/uploads/1/3/4/4/134401771/efda9a5242.pdfIn PDF document text
    • https://sanawovixib.weebly.com/uploads/1/3/4/6/134653903/dufibeboju.pdfIn PDF document text
    • https://mivijupa.weebly.com/uploads/1/3/4/5/134578330/tufog.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/7003023.pdfIn PDF document text
    • https://rudazolabogufaj.weebly.com/uploads/1/3/4/7/134772206/burigukojimin.pdfIn PDF document text
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/boziwevadulitisede.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/028db272-0720-4b6d-b6eb-5001efdc237b/cause_code_97_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/gakanedikal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc71e72-0ee5-42aa-89f2-0cc05f2a227f/holt_handbook_fourth_course_answer_key_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F2 5384 bytes
SHA-256: d5fe7e643e43e4c7e0f631cfcbb13e2544bb1be061e23aaac37b7b753bc4bd91
font_01_sfnt_off00013a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A16 10024 bytes
SHA-256: 6e532ae3480d80a4f94c0a1e98fb87bf16d0d231c740613808c1e6846d8a09d2
font_02_sfnt_off00015c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C63 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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