Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f71ab28ccbb6a7…

MALICIOUS

PDF

68.8 KB Created: 2021-01-03 13:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b899b93615b8280fc8dc3fb98b900f21 SHA-1: b659c0912978106545ff5e4c66bf2ad428ce1bfe SHA-256: 82f71ab28ccbb6a7b8b51a43fc5da1a821129918e91e63687ee33f9a6e3caf48
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leveraging embedded JavaScript for redirection or exploitation.

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/aws?utm_term=new+zealand+super+fund+annual+report PDF link annotation
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/1e3c596f91df22.pdfIn PDF document text
    • https://leniwexobopusez.weebly.com/uploads/1/3/4/7/134713406/6946697.pdfIn PDF document text
    • https://cdn.sqhk.co/rowalulo/qggiiie/time_traveler_from_2030_meets_himself.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454426/normal_5fa5c7f0d7369.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/ahigdXh/pixitracker_demo_version.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/eaf46f7206ef6a.pdfIn PDF document text
    • https://nopiroradonumiw.weebly.com/uploads/1/3/4/4/134401961/1531320.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/f2038ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82a9534-6534-4aea-b096-0cecdfbf644c/relation_math_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/najoxegu.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/68900297847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39b260c-8d89-4120-bebf-2b542925cf91/zosetezetevixobofoxeduso.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_off0000cc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6C 5144 bytes
SHA-256: 7f28f1536408f2abe1b4ac94632170e5e00c273e98c1a4cadd4c7c9a99a8b39a
font_01_sfnt_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 11312 bytes
SHA-256: f8a55eeb21f7c5de3de16ce150085c39653fe9239ddb8b6d90fa40393cf690dc

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