Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3e192d3adcacc0…

MALICIOUS

PDF

83.3 KB Created: 2021-03-19 02:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e94e3e81e1b073e46de7ab78c5593ae5 SHA-1: 1fbab5afb58bb05c09bd7f5523374b55d1d3c3b5 SHA-256: bb3e192d3adcacc05c050e37f85a8ff346c544dd09cb1209e5f70d7b1be735e5
156 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 appear to be part of an SEO link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URIs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=broken+silence+natasha+preston+pdf
    • http://natural-shop.info/mozovapetowvqrx2.pdf
    • http://pubguckazan.com/computer_programmer_jobs_salary_ontariouy3sk.pdf
    • http://jaxifas.getenjoyment.net/repolevofelojefigo.pdf
    • http://kujinatazema.sportsontheweb.net/jusisotape.pdf
    • https://waxamelajawima.weebly.com/uploads/1/3/4/6/134680886/betuwebilejose-kibij-jamusegek.pdf
    • https://birifebirox.weebly.com/uploads/1/3/3/9/133999865/477f1a396f62b.pdf
    • http://tradebot.space/49160714378ff6r0.pdf
    • http://jisutuxoxaza.medianewsonline.com/97257798793.pdf
    • http://milktree.store/how_to_organize_bookshelvesnl8wa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/moduluzuxikari/dslr_camera_photo_editor_for_pc.pdf
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_03cc036388df4a3d831839f229e4db83.pdf?index=true
    • https://s3.amazonaws.com/resabomibogodaw/64422761939.pdf
    • https://s3.amazonaws.com/bifadiwuwileji/91556597574.pdf
    • https://s3.amazonaws.com/nawosineromigi/50337473276.pdf
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_a592cb324d0c4eb5b55aef782c269915.pdf?index=true
    • https://s3.amazonaws.com/sazixipame/coffee_day_enterprises_limited_annual_report_2018.pdf
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_67d07ccdcd254d90a0250f3b6681643f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106c5.bin
32e38f32ea7fa1b7b0d2edd57c7da778f61b1609521e894b24e60f0b3ea28d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 5356 bytes
font_01_sfnt_off000118fb.bin
ca6e6d3ef9654d105d4065398c42f4c2f32b2989c30ade77bc7ab9947638188b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118FB 11316 bytes

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