Malicious PDF — malware analysis report

Static analysis result for SHA-256 50851594927d36b2…

MALICIOUS

PDF

70.6 KB Created: 2021-02-27 10:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7089280c2d45808ef525b99785e1b846 SHA-1: 9d0973d3abd30c6c7af0c8710130474eb4793af4 SHA-256: 50851594927d36b2af6f25325daae8c678f1aa3a0d2cc67e884624b2ae1c4734
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=how+to+define+iso+27001+scope PDF link annotation
    • http://zonizubiro.getenjoyment.net/nexawatakemobepini.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384655/normal_5fec12b2c122e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421478/normal_6028e4cc49f42.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/87541605937.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/learn_how_to_trade_binary_options_for_beginners.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469837/normal_5fed2c010e801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_603515c358d0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_602a4dd6719d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474979/normal_6030d94ead70e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_60359657af409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_6035642f42101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485442/normal_5ff01bc938c04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416326/normal_6008d4b71ab68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rulamiji.onlinewebshop.net/52748701876.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/what_is_44_cm_into_feet.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/wafube.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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 5272 bytes
SHA-256: 64b5b0a79146a24c687eeb2a18081403b9f14ef18ebd48c83f7739899f3be7e0
font_01_sfnt_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 10168 bytes
SHA-256: 51b9c384867b093bee631f4cbe104e884b6712f7449cd5bbfcd4f084c427e94c