Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ce74e507e6fd52…

MALICIOUS

PDF

77.8 KB Created: 2021-03-03 21:27:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8aa5ee1a71bfe0d8047f827078b28948 SHA-1: 8431147709e53867ed8fbea027b5565158d1b4df SHA-256: 91ce74e507e6fd5210972bca35b7e952143d81bfb9c6cb86765a82b26672a5d1
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to a gun safe review, serving as a lure to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/123?utm_term=winchester+gun+safe+12+gun+ts12-30+review PDF link annotation
    • http://jepewadagamer.scienceontheweb.net/28483655926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455405/normal_601d056af0576.pdfIn PDF document text
    • http://kadaxejob.mypressonline.com/the_angel_experiment_book_corin_grillo.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/haWnNib/xufipubifeparigof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450045/normal_6000065f8f8d4.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/which_brand_water_heater_is_best_in_india.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/iaXticL/vosokozawavukoporoga.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/ks7Hhch/15242225706.pdfIn PDF document text
    • http://wemuwugisenoro.iblogger.org/how_to_factory_reset_adt_camera.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/eIkhijd/dafubixafezamufugumepaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465707/normal_60075529ba460.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_600984fbcd836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_603f2f621b5e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414360/normal_601d29e2b9565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_60152ceb13241.pdfIn PDF document text
    • http://fexuvukenix.22web.org/30547987821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_60380615bb183.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493550/normal_5ff15aeee0daf.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/48315396709.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421957/normal_5fdff85f7af09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rowavironipomiz.epizy.com/resume_templates_for_auto_body_technician.pdfIn PDF document text
    • http://pejaxuvotovu.rf.gd/zerolewitolotoruw.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_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 5800 bytes
SHA-256: c1f79a6ec4eda3a192514da43da2b005a7798dac1259ebcf181223680978e489
font_01_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 11216 bytes
SHA-256: ce24ee5b78730df9d83e274e8411630f90b86a661752c60d83961f1d6e0213ac

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