Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7d5f9b7604f2e3…

MALICIOUS

PDF

76.3 KB Created: 2021-03-12 16:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e52628e62e7f5eb06f6856dcd4f8f4f6 SHA-1: 823d1ac62d61f21f480a481bc010973c330c47fa SHA-256: ec7d5f9b7604f2e3253dbea82ca22ef879330a3ed9f269b1ce37d0642c902203
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as search results for educational content. The primary URL, https://mezovuduw.ru/award?keyword=mother+and+baby+animals+worksheets+for+kindergarten+pdf, suggests a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or malware distribution attempt.

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://mezovuduw.ru/award?keyword=mother+and+baby+animals+worksheets+for+kindergarten+pdf
    • https://kuwujevo.weebly.com/uploads/1/3/4/8/134864034/wifil_tizatibur_tidazozijeso_vusikutifofix.pdf
    • https://zupakikaxabu.weebly.com/uploads/1/3/1/3/131380404/761936.pdf
    • https://cdn.sqhk.co/bedogipaxog/4jjidtO/dalabisitorasijewudi.pdf
    • https://cdn.sqhk.co/tosilura/gdidhbE/kolo_a_color_maze_puzzle_games.pdf
    • https://cdn-cms.f-static.net/uploads/4366646/normal_6037e9209c5bc.pdf
    • https://cdn-cms.f-static.net/uploads/4496582/normal_5fd3164710a95.pdf
    • https://cdn.sqhk.co/jakufomego/hdCVrgf/23670921357.pdf
    • https://cdn.sqhk.co/feguzuvubut/bgg78O8/jugodoravojotizipov.pdf
    • https://cdn.sqhk.co/nifodotiriru/kVFjgn0/23964049006.pdf
    • https://wazalopa.weebly.com/uploads/1/3/0/8/130814586/9962457.pdf
    • https://cdn.sqhk.co/pigevikuwi/lYbhggh/cut_cake_into_8_pieces.pdf
    • https://butadopol.weebly.com/uploads/1/3/1/3/131378795/6346341.pdf
    • https://kobejepofefes.weebly.com/uploads/1/3/5/3/135317692/kejabawogovasog-defizu.pdf
    • https://cdn.sqhk.co/gijimexuv/ngdjhn5/launchpad_trampoline_park_prices.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_676dff53e98f43d98dcf1ae85113d2a5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/15af3664-5d0a-4c39-b66b-194cd96b74da/85822711617.pdf
    • https://uploads.strikinglycdn.com/files/621c7370-422b-4b9d-b324-d6e562505dd4/60062299266.pdf
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_99adaae308144fab8b12c155a34c7693.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7748d5ce-2541-47c8-bebe-13aff6bb9e28/fevufupofivib.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e345.bin
317c56b7eb0d688f731328a9aed18272e31c45c9a337804cd9f5d03a3be6ecd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 5648 bytes
font_01_sfnt_off0000f663.bin
566feac902720ebe5cbda81a307a511a8a5061d2f62991a4afdc9829a0f4f056		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 10612 bytes
font_02_sfnt_off00011a9b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 4324 bytes

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