Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10b3d4623cd7780…

MALICIOUS

PDF

76.9 KB Created: 2021-03-30 09:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c2dc945b53043f88f350b5e096f03957 SHA-1: ed50d14452db09402c7cc5ff592759ef14937790 SHA-256: e10b3d4623cd7780e73b2fe91925012cc5dd0142f3a27acfbbf5dd62c3adce3d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://baarspo.ru/123?utm_term=fishing+report+nysdec PDF link annotation
    • http://trokot-newshop.online/duplicity_in_a_sentence_as_a_verb9t6cg.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/6jdhhdK/is_there_an_xfinity_race_today_on_tv.pdfIn PDF document text
    • https://xekurisiwa.weebly.com/uploads/1/3/4/4/134401096/gefikuv-fogixukaj-wolutugezuje-kenuteso.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/41602494648.pdfIn PDF document text
    • http://redirunna.xyz/angular_form_validation_pattern_examplenk7hs.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/cky7Whc/36510313925.pdfIn PDF document text
    • https://buvisipafen.weebly.com/uploads/1/3/4/4/134401595/6a19b6.pdfIn PDF document text
    • http://supernefritroller.xyz/alumbrado_publico_definiciondqrr3.pdfIn PDF document text
    • http://jirusulixozome.scienceontheweb.net/que_significa_titulo_salvage_en_un_carro.pdfIn PDF document text
    • http://alexandreablog.com/housekeeper_deluxe_sewing_machine5btt8.pdfIn PDF document text
    • https://nojokuvevufig.weebly.com/uploads/1/3/4/1/134109253/76ac47.pdfIn PDF document text
    • http://torixobo.mypressonline.com/8274636761.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/cNpEgiy/zelle_limits_wells_fargo.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/wiahjB0/live_tv_streaming_apps_free_trial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wovibojo.onlinewebshop.net/89247615684.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_1cc75c289594496aa4763f43c908c6ca.pdf?index=trueIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_871632cc029d4848adf5fc8b9c1828f1.pdf?index=trueIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_f9b3c42428f44ec3a56c63d3001de837.pdf?index=trueIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_d010475709b74524987da98ae5173ec3.pdf?index=trueIn 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_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 5152 bytes
SHA-256: 8aa517088bbff1f1ca9af0dae3ff86eb2f1aea924afe55b83256e8a2c9bdff75
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 11296 bytes
SHA-256: f4bfe303b2c2a9f7eda0cb961f5197aee13315fe68b772beba311145f63e9d18

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