Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcdd3b8e1c75190…

MALICIOUS

PDF

86.5 KB Created: 2021-02-24 13:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a144d4ef83f7083440794cf425e2bc69 SHA-1: f2a4f819b9caaf39181b909346a1bca2c0c1427b SHA-256: cbcdd3b8e1c7519054452fa5c99cb535aaa6b7c99dfd3d4d5f0a005b1511f4c8
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a tactic to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wix?keyword=summoner+name+change+cost PDF link annotation
    • https://cdn.sqhk.co/pobumepova/cgegije/winter_mountain_sniper_modern_shooter_combat_apk.pdfIn PDF document text
    • https://supipujijasof.weebly.com/uploads/1/3/0/7/130739476/mudigowubegevig.pdfIn PDF document text
    • https://pavemizex.weebly.com/uploads/1/3/1/6/131606984/paxifejam.pdfIn PDF document text
    • https://wadumajaniko.weebly.com/uploads/1/3/1/3/131383958/914311.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391024/normal_6001f974cccb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_601acfd016e35.pdfIn PDF document text
    • https://dajukufatob.weebly.com/uploads/1/3/4/3/134345308/5144880.pdfIn PDF document text
    • https://wokuzavewa.weebly.com/uploads/1/3/5/3/135339714/naxewoturok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_6025b3daac2b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371248/normal_5ffadb9b5f0d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_60157f7c55c1f.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://s3.amazonaws.com/juvetaso/komefirufonug.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/adrianna_papell_long_formal_dresses.pdfIn PDF document text
    • http://lifarodanudu.rf.gd/gipibojivolab.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/rujiwakenipurug.pdfIn PDF document text
    • http://nadefivetokilak.rf.gd/acpi_ven_sny_dev_5001_driver_windows_10.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_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 5116 bytes
SHA-256: ebe3f2b126c7d3642b154e82611e6aebeb7934b7bbeac802c75454d0ed462b6b
font_01_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 10700 bytes
SHA-256: 041be9a18a8766f5e7c9c5a63badb5841595ca8d56d2d60c6d7c480cb2b08c99
font_02_sfnt_off00013efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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