Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcaa6859a1e84547…

MALICIOUS

PDF

76.9 KB Created: 2021-02-20 05:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d74f16cb543424ddfd0375b9604e1481 SHA-1: bd3d0dc98ed7b598a9435ab9bb23a75d76b4c76d SHA-256: dcaa6859a1e8454781074aa6ab7dae4a00e2fdbbf981f8a459fcff9698f58532
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary purpose is to redirect users to potentially harmful external 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://jacksth.ru/123?utm_term=oat+score+range PDF link annotation
    • https://vaxokivov.weebly.com/uploads/1/3/1/4/131453734/658013.pdfIn PDF document text
    • https://duwizule.weebly.com/uploads/1/3/4/6/134663296/zuzafolariropilutale.pdfIn PDF document text
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/sewekeno.pdfIn PDF document text
    • https://bozaveruri.weebly.com/uploads/1/3/1/4/131483492/viladar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5fd8d486061a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_5fe64f8a7bf82.pdfIn PDF document text
    • https://jugukibe.weebly.com/uploads/1/3/0/7/130740256/geketiw_dilujufaka.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/9215013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472208/normal_5fdecaf8a7ab8.pdfIn PDF document text
    • https://regakoxunurur.weebly.com/uploads/1/3/4/3/134380337/mowawuxidutemiwe.pdfIn PDF document text
    • https://nepefesin.weebly.com/uploads/1/3/1/4/131410606/movexepinuki.pdfIn PDF document text
    • https://ratofesut.weebly.com/uploads/1/3/5/3/135304008/zufanudafoposevelibu.pdfIn PDF document text
    • https://napufifibadabe.weebly.com/uploads/1/3/1/4/131406817/978294874484.pdfIn PDF document text
    • https://fosuwelu.weebly.com/uploads/1/3/2/6/132695698/1776a611d0919.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/fojaxexino/dr_web_antivirus_cracked_apk.pdfIn PDF document text
    • http://lipunigofajeza.epizy.com/4747166941.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/aware_sentence_formation.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_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 4960 bytes
SHA-256: 2a58e42222de8e242aeb11591bba9ed05ac6f46f4b214f5e9ca86a272c9c5ccf
font_01_sfnt_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 11104 bytes
SHA-256: 6c8cb4bfdb16e0650deebc07ede7ed4fc0d4fe4c25f005c50dfa9da8becef7d1

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