Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8cb981f79bf5c3…

MALICIOUS

PDF

83.1 KB Created: 2021-03-13 22:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bc180f0ecb775a917192582b698c968b SHA-1: 272317dc921612a02e3067cded8509303dc9ffed SHA-256: 9f8cb981f79bf5c341fc48d5867ec0f0ab503e95ab7ebdda9a7feca7860e046c
202 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and a lure for fake invoices or payment requests. It embeds multiple external URIs, with a significant number pointing to disposable hosting, suggesting a phishing or malicious download attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/123?utm_term=night+time+attendance+allowance+form PDF link annotation
    • https://cdn.sqhk.co/pajokiman/gjiI9ib/ice_machine_for_shoulder_surgery_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/cQhchgC/24419886767.pdfIn PDF document text
    • https://cdn.sqhk.co/vutenugade/hgAwjLs/hero_rescue_level_223_impossible.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/muxuminanulit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wedizakur.epizy.com/bridgewater_market_report.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_0c0bca2c93954515b1ae8f7f4311a38a.pdf?index=trueIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_e1eed48f73464f0db5f49fbc3120d188.pdf?index=trueIn PDF document text
    • http://wepikupovug.myartsonline.com/noranuladasexode.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_4d7c75e99a394824bbe8c5ff94cac246.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_fdb0bef54b444959a0eedd1562378c86.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_42ab998c8eac4257a45cfa4d47a4d096.pdf?index=trueIn PDF document text
    • http://kopolug.myartsonline.com/kitchenaid_stand_mixer_replacement_whisk.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/extended_essay_guide_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/newigaxevapati.pdfIn PDF document text
    • http://tinodaxaxaduj.rf.gd/bean_bag_3d_max_model_free.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_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 5320 bytes
SHA-256: e4d2f8b8e35765efbfd9baa9f89293ee4264605a0cfe02628ea213d1f52eebf3
font_01_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 10728 bytes
SHA-256: 6020b7b68e560523c32e323561a3788478999605f90f64ee6fc3992b2858d8e4

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