Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17b531d7835c24c…

MALICIOUS

PDF

71.9 KB Created: 2021-03-02 11:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f61afce087648da06ec74f0e42894bef SHA-1: 8c264f3645042ce2de707095cdbca907e3fb7b7e SHA-256: d17b531d7835c24c81cacf3dfe26302866c07257ff5b2a6fb372be7b529ffc72
146 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It employs a link farm strategy with numerous embedded URLs, including one that impersonates a "Washington gas bill mailing address" to lure users. The document's structure and the presence of embedded URLs suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vilenefex.ru/award?keyword=washington+gas+bill+mailing+address PDF link annotation
    • http://therarbooks.com/asco_guidelines_head_and_neck_cancerq32se.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/h6phfii/htc_weather_widget_not_working.pdfIn PDF document text
    • https://bamususifilozok.weebly.com/uploads/1/3/1/3/131383301/9d95b.pdfIn PDF document text
    • https://biditeso.weebly.com/uploads/1/3/4/3/134339176/3056995.pdfIn PDF document text
    • http://arfesopt.com/jam_double_chill_speaker_how_to_turn_on3fgjl.pdfIn PDF document text
    • http://teksalle.xyz/majulowemazasusegp780.pdfIn PDF document text
    • http://tonagruz.ru/ada_diabetic_diet_guidelines2t5ma.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/igzVjFL/burger_shop_2_free_online_no_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402944/normal_5fe4554e18b97.pdfIn PDF document text
    • http://begetus11ppz.xyz/52166577290s9p2r.pdfIn PDF document text
    • http://rastet-malysh.ru/45321852149a1r7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499673/normal_602d0d2984af4.pdfIn PDF document text
    • http://meblik.su/gamo_air_rifle_owners_manual7extf.pdfIn PDF document text
    • https://cdn.sqhk.co/xaduwudixum/zsihJha/doom_2_rpg_jar_128x160.pdfIn PDF document text
    • http://ourfutures.space/ordering_numbers_worksheets_3rd_gradex8s5q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_5fd62848abca2.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/ffjicLf/dwyane_wade_net_worth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 5392 bytes
SHA-256: c7d8c98bf5643b561c1ed644a3371c48500910734eddcde09d110b9fcf8b0457
font_01_sfnt_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 10460 bytes
SHA-256: d3ec37803c4478ebc9e5dd0536fa9ecf4cdeca898312dd1b8d60ec426465cfac

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