Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc0d2385e9f2a30…

MALICIOUS

PDF

91.3 KB Created: 2021-02-18 05:09:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cb4460b68a5c41d8b5ca45462005a545 SHA-1: db862479424ee0eb8509b9fdbfe8d6fa58fa1526 SHA-256: bdc0d2385e9f2a306f8b7b12c921ab5f203ef740de8baf17b7869b1aac268a9c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/aws?utm_term=how+to+write+proofs+discrete+math PDF link annotation
    • http://help-copyrightservice.xyz/2111767612veahu.pdfIn PDF document text
    • http://romeoplanet.club/sivifixadeveserubegerugo09y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_5fda0b14aefa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_6021bb2eea5ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486565/normal_600410c9112e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_5ff0c370af2dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5fcb15e7b66bd.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/rosawufusif.pdfIn PDF document text
    • http://geosen.net/idle_champions_cramped_quarters_formationdit9i.pdfIn PDF document text
    • http://ita-talia.fun/imaginarium_mountain_rock_train_table_instructionst8qb0.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
    • http://kaxumepidigiwe.rf.gd/del_mar_weather_report.pdfIn PDF document text
    • http://zisibife.epizy.com/bikram_singha_bengali_movie_hd.pdfIn PDF document text
    • http://butadiviwev.rf.gd/95267025232.pdfIn PDF document text
    • http://gatapin.rf.gd/93800380441.pdfIn PDF document text
    • http://gopivikanofo.rf.gd/5655729710.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_off0001166d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 5096 bytes
SHA-256: 69e8a3a34bee7e5a139dc8a5519de6f85f1ede3a479d214f62ac43c8025c9273
font_01_sfnt_off000127cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CF 12012 bytes
SHA-256: b740d588b23838671f11fd0447a38d0b4a84697f514e8e102d2d80d5f0efbbe3
font_02_sfnt_off0001506b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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