Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cc8ff321114ccf…

MALICIOUS

PDF

77.1 KB Created: 2021-02-28 22:11:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5e29aa02e09c0e8a695a050633f783a3 SHA-1: fc4ba2dc2e5a33fa05bea61388173cce81555903 SHA-256: b2cc8ff321114ccf52a9923631fc5c56c7255ed148ac29dcdcb987ae01cf219e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, suggests a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing or malicious content delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://xajibur.ru/strik?utm_term=.380+bersa+thunder+review PDF link annotation
    • https://dopapixe.weebly.com/uploads/1/3/1/3/131383645/loganeg.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/books_on_how_to_get_a_man_and_keep_him.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/hghgC0n/32907871271.pdfIn PDF document text
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/xidogorazixemef.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/y8egZgc/bounce_back_loan_natwest_foundation_account.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/gdCfgel/sonic_hoverboard_racing_game.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/ichiaha/here_go_hell_come_bl3.pdfIn PDF document text
    • https://jotigigej.weebly.com/uploads/1/3/0/7/130739509/f8a28c22.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/lupuvogotog/jowuganatebofatixolejeri.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/ada_dka_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/bewobunuwegowowubur.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/tricep_kickbacks_proper_form.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/mididusogefikogiboxe.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/vevolikajotebiz.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/balejawikuvafejub.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/birthday_cake_with_name_for_husband.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/divadasaf.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/feng_shui_home_design_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/simple_java_tutorial_for_beginners.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_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 5608 bytes
SHA-256: 5e9c3e7714f9a3e2196f78d39c0d0e489ade18edab15a9636c9bdd43243a21ea
font_01_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 10640 bytes
SHA-256: aa1a737d1e2ed0e5c318dac16206207394d2ee43efc39ac2e8e25322a692ba2f

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