Malicious PDF — malware analysis report

Static analysis result for SHA-256 81aa2b063a9ac0e5…

MALICIOUS

PDF

67.7 KB Created: 2020-12-05 23:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 567e545fb8c3b011b9af9030e62c7ead SHA-1: 14a8011621145d5d0dc2506e007a3ee9ba85ccab SHA-256: 81aa2b063a9ac0e544629f84b8954a163b40e5665eeb402c04537f66b60e8a60
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to distribute SEO-optimized PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/aws?utm_term=ignou+date+sheet+2019+pdf
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/newasesepubaw.pdf
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/4731421.pdf
    • https://cdn-cms.f-static.net/uploads/4416660/normal_5fab7d4a19a47.pdf
    • https://kuvejepi.weebly.com/uploads/1/3/4/4/134452054/vomuzenomemolol.pdf
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/d8a1fcb.pdf
    • https://norudajesopoz.weebly.com/uploads/1/3/4/3/134340776/biveguboxawimekow.pdf
    • https://static.s123-cdn-static.com/uploads/4464996/normal_5fca06105c710.pdf
    • https://nigiseza.weebly.com/uploads/1/3/4/4/134462574/lawaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc57e843398ff75154ce56f/t/5fc5e6533570fb44d1cec8ec/1606805076230/adjectives_starting_with_c.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe17329d7936484056a548/1606293299005/82271057052.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcef5068bfc5186166706c/1606217557228/zisinegixelaxivanoritimav.pdf
    • https://static1.squarespace.com/static/5fc110906609fd0ee7923de0/t/5fc4f3203c6ccf69f3f9e6ef/1606742818949/wheelocks_latin_7th_edition_download_free.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf7ea7acac6192a86373f/1606285298421/64154666998.pdf
    • https://static1.squarespace.com/static/5fc0e70d1452f90b7fe56088/t/5fc251e5f3de5e49b5b01a17/1606570470874/bissell_proheat_25a3_manual.pdf
    • https://s3.amazonaws.com/bisazabe/bksblive_test_answers.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd2243352d7073061f946d/1606230596008/always_sunny_dee_characters.pdf
    • 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_off0000cb34.bin
3d33b29a1c7c3c1c5569558a7865edf87a7cceb9b81e21695cd37bacaa8ad114		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 5592 bytes
font_01_sfnt_off0000de49.bin
edb703ac4eb7ae479a45c4dc13f26264a8908fe0152c9ad6c238f59587d9506a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 10424 bytes

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