Malicious PDF — malware analysis report

Static analysis result for SHA-256 5426afc30ec11de2…

MALICIOUS

PDF

83.2 KB Created: 2021-04-01 06:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 27ff5bed972fac27f1350595ec0e3d1f SHA-1: 158400fb161d373ebc8bd32fa6d0602c0ebb743d SHA-256: 5426afc30ec11de2eed45ead22cf6d0f6bb8c0bc4e5c68645b79fdd19cb01216
186 Risk Score

Malware Insights

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

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 0.9996

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://zajinet.ru/strik?utm_term=sony+a6500+review+youtube PDF link annotation
    • http://vykupavto54.ru/probability_igcse_questionsg8pfr.pdfIn PDF document text
    • https://cdn.sqhk.co/rexazileka/ghhjgds/warriors_of_fate_characters.pdfIn PDF document text
    • http://reweder.site/brts_bus_full_form2xr9i.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/Fghha2K/free_fortnite_account_information.pdfIn PDF document text
    • http://betixisu.22web.org/billi_boli_meow_song_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/JiifggM/tewomaxulumifarimile.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/cihbvhh/53634533858.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/n4hgFrL/the_legacy_of_the_bones_review.pdfIn PDF document text
    • http://ukranews.site/zudob6dkmi.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/2v1J9zx/13284210270.pdfIn PDF document text
    • https://cdn.sqhk.co/jexumumir/jccggTj/21379201639.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/1yRw9nc/52305904590.pdfIn PDF document text
    • http://xonibiz.22web.org/fibers_and_polymers_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://raseloxezonavo.epizy.com/95643956710.pdfIn PDF document text
    • http://komewubot.epizy.com/40213149435.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_75b3ab3442cb4e0ab2073cf09bba6542.pdf?index=trueIn PDF document text
    • http://fewuzefar.rf.gd/vusovapakisox.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/69750401332.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_09ca1d3850b0403cb603d463b92c42c5.pdf?index=trueIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_ea19f88620614204bb41f11fa65b48c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisazabe/ray_ban_face_shape_guide.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 5268 bytes
SHA-256: 7f1a6fab6719c1f4e91b9f06613b4f1b27ea7750ffd83f062c621c710404150c
font_01_sfnt_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 11636 bytes
SHA-256: 418f446b2932e8cdf210b038de22f67275edeb1f13d186da8d2997a8d81fcf76
font_02_sfnt_off000131d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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