Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c92456e2aff01ee…

MALICIOUS

PDF

77.7 KB Created: 2021-06-11 05:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b2db6bd0a404c77293bf9205d2afd0a5 SHA-1: 54a41bc4e9d6ccfcf872da969592e27c9eb7b391 SHA-256: 2c92456e2aff01ee89d91fd0d3d49fb2842454f5f7c86e91565f56c8c5ae712c
146 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic further indicates a potential scam or phishing pretext. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards malicious intent, likely involving the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://irlanc.ru/pbw?utm_term=nsk+bearing+pdf+catalogue PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460944/normal_60262bf310f2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_604e32aa6cda3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_6063954192361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460981/normal_6061da6832ab2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5fe3584f4340f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472182/normal_5fe2db1e36095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413457/normal_60607b8af2cd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420019/normal_6008ea98b2add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_6064aee99af4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5fd170a6aa88c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wikitaxif.pbworks.com/f/how_to_create_theoretical_and_conceptual_framework.pdfIn PDF document text
    • http://wasazejis.pbworks.com/f/advanced_economic_theory_by_hl_ahuja.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/8452973521.pdfIn PDF document text
    • http://mupalunava.pbworks.com/w/file/fetch/144650430/my_maytag_washer_will_not_turn_on.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/f/gta_vice_city_free_download_for_windows_10_offline_installer.pdfIn PDF document text
    • http://pajinap.pbworks.com/f/realidades_2_capitulo_3b-1_answers.pdfIn PDF document text
    • http://lutagunis.pbworks.com/f/sedabopukudifusopigajapo.pdfIn PDF document text
    • http://masawumel.pbworks.com/f/how_to_fill_scholarship_form.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/kannada_rasika_kate.pdfIn PDF document text
    • http://kibarilotog.pbworks.com/w/file/fetch/144818973/bejexele.pdfIn PDF document text
    • http://zigunef.pbworks.com/w/file/fetch/144950214/pakadimozinarizosuno.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_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 5496 bytes
SHA-256: 83a4c9e2b4259daebe6c9682230c1583a8fea72802a02b121d15d93483729ee4
font_01_sfnt_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 10736 bytes
SHA-256: ab5e472ee36d09a76f2cb7b02629ca37c43bc1e57a07da3e4b7c681bf61759d4