Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53b0da87db7cda6…

MALICIOUS

PDF

71.0 KB Created: 2021-02-16 19:25:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1f5d23a88e4dc05d670f1863ff3188bc SHA-1: ba678fdcd6c2ce7cd4506381efeb758bfb8eb4c9 SHA-256: e53b0da87db7cda68e1a9df7db2d73cc2b3a6d11439e41798528defc4e06b907
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, including one pointing to 'bologen.ru', which is likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to a 'Bowflex treadclimber manual'. No scripts were extracted, but the presence of multiple suspicious URLs and the overall heuristic profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wix?keyword=bowflex+treadclimber+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407733/normal_6003384625079.pdfIn PDF document text
    • http://tersq.space/fortnitemares_challenges_cheat_sheet_chapter_2do1dh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_5fe9d0558819b.pdfIn PDF document text
    • http://giveaway2020.info/lagesowizega7rm1x.pdfIn PDF document text
    • http://about-fb-support.com/obusforme_king_mattressvv4we.pdfIn PDF document text
    • http://remontnatali.ru/43064259141prd7j.pdfIn PDF document text
    • http://thailandlove.site/new_bodybuilder_imageg5czg.pdfIn PDF document text
    • http://babysampler.com/15358864372dsums.pdfIn PDF document text
    • http://francobusiness.com/rabbit_population_in_australia6zp77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369315/normal_5ff6590f7de33.pdfIn PDF document text
    • http://all-gopro.com/78302188844vi7mi.pdfIn PDF document text
    • http://easycreditscore.info/sogovtok4r.pdfIn PDF document text
    • http://7lessons.website/diagnosis_atresia_esofagus1c0to.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5ffb96a1ca626.pdfIn PDF document text
    • http://naturalgood.space/the_5th_wave_rick_yancey3258u.pdfIn PDF document text
    • http://xeeewq.xyz/jakusenovoripurape6kpin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mutirexa/contoh_bisnis_model_canvas_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/18666304918.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/society_audit_report_format_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/kawasaki_er6n_2012_owners_manual.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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 5340 bytes
SHA-256: 6ca4e274f317916d3bc6531ca53b78d380b2a1679bbfc2168e5727446cf4dd6c
font_01_sfnt_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 10724 bytes
SHA-256: ddfba5cf6aa3389982582af27875def03f64a14f30f565444271fc21b2fd9241

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