Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb12f5fe1658ffc3…

MALICIOUS

PDF

70.4 KB Created: 2021-02-17 16:09:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b457a6dbeeb7b73080421e502bc5a42f SHA-1: c92ba31c36eb83c454e651cda7457ab63b5c5633 SHA-256: bb12f5fe1658ffc3c05bb7e38f6eab625c4dafeb1396abb9196ac47485c92167
134 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and a phishing lure, with ML classifiers and ClamAV confirming its malicious nature. The document body, though heavily obfuscated, suggests a pretext of filling out a form. The embedded URL and a linked PDF on disposable hosting are strong indicators of a phishing or malware distribution attempt.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://maypoin.ru/aws?utm_term=how+to+fill+out+a+release+form PDF link annotation
    • http://store50off.info/21050121714ibj6s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_5fd73d09d1b2e.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/idtjdKH/big_hunter_game.pdfIn PDF document text
    • https://todoxaladavefuk.weebly.com/uploads/1/3/4/5/134529573/segimagijizilan-matizurema-mibepenerak.pdfIn PDF document text
    • https://gevexivojuler.weebly.com/uploads/1/3/4/4/134444242/8249800.pdfIn PDF document text
    • https://woluxubofij.weebly.com/uploads/1/3/1/3/131383763/3a6268cf32be.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/bohdhge/1762104545.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384295/normal_5fc71afe1e4cc.pdfIn PDF document text
    • https://cdn.sqhk.co/nexifatogex/YhhIcj0/dragon_quest_of_the_stars_guide.pdfIn PDF document text
    • http://klokisik.space/bopudajuwekeribakebvkv6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369916/normal_600494c8104b9.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/hcfiaRf/saturday_weather_liverpool_ny.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/46880553736qheti.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/fEgf5jh/i_god_meaning.pdfIn PDF document text
    • http://tubudemawaxoki.iblogger.org/lajuzeroluj.pdfIn PDF document text
    • http://pirawamajakemiv.22web.org/fmea_template_for_software.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/gelawiweza/jealous_labrinth_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/fularilem.pdfIn PDF document text
    • http://topuwagib.epizy.com/31015128073.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/pafapowonagun.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/bejijog.pdfIn PDF document text
    • http://latilofu.rf.gd/footer_template_bootstrap_code.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_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 4964 bytes
SHA-256: 8af061e1633314e0e9100d5fbc7794ac86341ec0dfdf22cf032f9417d6d6ced6
font_01_sfnt_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 10764 bytes
SHA-256: b64a7fceb08f4cafe83c59e23ee0c02a35cf92a504f2f2dd3fcb60bde8e2640d

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