Malicious PDF — malware analysis report

Static analysis result for SHA-256 b363ff14c8e30830…

MALICIOUS

PDF

82.3 KB Created: 2021-04-12 07:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f98fe3859d5867be09845b0e63f6f5ed SHA-1: 07738e79930577c691b94eddc8c2fecc9b1a7eb1 SHA-256: b363ff14c8e30830473d70072b43170fb0d1e55464e4d85a956832579b6d0405
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF SEO link farm, with one prominent link pointing to a suspicious URL. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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/strik?utm_term=american+history+x+netflix+2020 PDF link annotation
    • https://fubafutevulaz.weebly.com/uploads/1/3/1/8/131856433/lixixabedodabiri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_60682ec1e7417.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494431/normal_5ff477c183b2b.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/oracle_sql_datetime_-_datetime.pdfIn PDF document text
    • https://guzagotoxi.weebly.com/uploads/1/3/5/3/135313280/0fe1e7c583ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471688/normal_601713aa55ce2.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/non_benzenoid_compounds.pdfIn PDF document text
    • https://rimokukesezawuk.weebly.com/uploads/1/3/1/4/131437069/kolefaleniwowu-vanoxev-juxodinejan-wijetif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_606223709607e.pdfIn PDF document text
    • http://zubudiru.sportsontheweb.net/61244114084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_606b0c3472b7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_5fdc327911fd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_6033284f348f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446388/normal_6005d8b43d0cc.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/jobikiralogepudamal.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
    • https://s3.amazonaws.com/sinadi/jazowewoli.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/lajuvone.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/difference_between_mini_dvi_and_mini_displayport.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/wanolelujamesuxasev.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/51329488602.pdfIn PDF document text
    • http://tameladizikep.atwebpages.com/xizivewuno.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/ethiopian_reporter_amharic_version_today.pdfIn PDF document text
    • http://paxerakomis.onlinewebshop.net/excel_vba_tutorial_2020.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/unir_dos_en_uno_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 5344 bytes
SHA-256: d457f762cf03841261fa3d3b3cac537a3259ac8abab5b92d7233b0f176162683
font_01_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 10724 bytes
SHA-256: 2e0b4be183cc30d58980c911fd085b9bcc22ef6bdb955d2013e7bae9d6b4f832
font_02_sfnt_off00012d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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