Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b69742926b4e51…

MALICIOUS

PDF

78.5 KB Created: 2021-02-25 20:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1e98f9d7849b436d16172447c49d91f3 SHA-1: b85b7ee291fdad4bba15b21f513c33ac43d8ccd6 SHA-256: b5b69742926b4e51b955b9af10e96ce27471f9a559e664f73896b57b08ec746d
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDFs hosted on various domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/123?utm_term=lg+mini+split+heat+pump+manual PDF link annotation
    • http://dagomakiluje.iblogger.org/boosted_performance_350z_turbo_kit.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/4882135.pdfIn PDF document text
    • https://lojexidipiwakif.weebly.com/uploads/1/3/4/0/134041559/8195841.pdfIn PDF document text
    • https://pulapafux.weebly.com/uploads/1/3/0/8/130874232/9853892.pdfIn PDF document text
    • https://dufofisejufosu.weebly.com/uploads/1/3/4/8/134875198/7091274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420764/normal_5ff9ddd747227.pdfIn PDF document text
    • https://nelajelax.weebly.com/uploads/1/3/2/7/132712676/jagefokinotorumavano.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/742b3.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/list_of_terry_pratchett_books.pdfIn PDF document text
    • https://zabuxowinuj.weebly.com/uploads/1/3/4/8/134874463/3844661.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/zuses/android_studio_buildtypes_debug.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/how_to_determine_rebar_size_and_spacing.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/mikosuxatuwep.pdfIn PDF document text
    • http://fejuzezoj.epizy.com/guxosofodumis.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/subclinical_hypothyroidism_treatment_guidelines_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/adobe_illustrator_business_presentation_templates.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/willy_wonka_and_the_chocolate_factory_1971_songs.pdfIn PDF document text
    • http://semabuxof.rf.gd/traducir_de_espaol_a_frances_gratis_online.pdfIn PDF document text
    • http://luzowotobor.rf.gd/rakuvewidokid.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_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 5076 bytes
SHA-256: c2c4cbd288fc63f61861276c3024ed4da279ab397e3e802f26726285d01a5887
font_01_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 11672 bytes
SHA-256: 8856b35943b140a357650cba9b798cd3beaf7e370584ba966018b622d5da41cb

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