Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb3010ad9da22ee…

MALICIOUS

PDF

73.3 KB Created: 2021-03-29 21:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d6709a5d4cafbc4a5ab9134d0a57465c SHA-1: c2827c40e4c362fb7f42dae6e68e543fa0a11b9a SHA-256: cfb3010ad9da22ee97bcebca8ca472c20e1f979a99b9f80bcf1ae63753ba68c3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the linked content. No scripts were extracted, but the sheer volume of external links suggests a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/award?keyword=rent+lease+form+pdf PDF link annotation
    • https://cdn.sqhk.co/talurelope/bQ9v9uJ/japanese_ice_cream_rolls_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/hWMhihf/53892282469.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/vlfjfjb/sumenevarejataxew.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/djauPha/incremental_synonyms_list.pdfIn PDF document text
    • https://vudulami.weebly.com/uploads/1/3/5/9/135964857/takipupuxan_xepok_wolexababowovur_tepidorozatalar.pdfIn PDF document text
    • http://logunesunoj.medianewsonline.com/solid_angle_concept.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/kgL8Xt0/binomische_formeln_wann_anwenden.pdfIn PDF document text
    • http://mekapidi.medianewsonline.com/86050844939.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/jakiboluz-jitovosone-namitis-sudoluvuduwew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fizanotafogibag.rf.gd/danby_portable_air_conditioner_review_14000_btu.pdfIn PDF document text
    • http://mijemem.rf.gd/99418789322.pdfIn PDF document text
    • http://vewawisu.onlinewebshop.net/19824714000.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_84e6a115cf354004b2b9b8c8d0bcd5c0.pdf?index=trueIn PDF document text
    • http://tubujaj.epizy.com/brother_sewing_machine_model_cs6000i_manual.pdfIn PDF document text
    • https://621cd70f-1aca-46de-91df-1bd8162c3e90.filesusr.com/ugd/9f1ad6_460650b22aa14209b88f9674aade2e3c.pdf?index=trueIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_f37df32d3daf46d0955bb564b5696aae.pdf?index=trueIn 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_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 5196 bytes
SHA-256: f5df7b7874113923dafb40908697ca6b707be8fc68e4c042154feca60026f61a
font_01_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 10664 bytes
SHA-256: 87307fc139e49090420e4b1d1c5397813db362cc838aaf619e1bd1671226cc43

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