Malicious PDF — malware analysis report

Static analysis result for SHA-256 d722100df3431a78…

MALICIOUS

PDF

50.6 KB Created: 2021-03-06 04:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6b4555dfe19d3c229d2a6bdab393336 SHA-1: 4c0dcba725b4135bcf4b6d5f400bcb41a47a6075 SHA-256: d722100df3431a783ac5a132fc46a1a2b309fb5e80ed9d90c3b4da456a83426b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9328

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 50 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/aws?utm_term=discrete+and+combinatorial+mathematics+an+applied+introduction+ralph+grimaldi+fifth+edition
    • https://cdn.sqhk.co/temirikuji/hbgeSq8/hero_xtreme_160r_blue_color.pdf
    • https://makifilibavik.weebly.com/uploads/1/3/5/3/135383918/9059802.pdf
    • https://ruworelolovifuf.weebly.com/uploads/1/3/4/4/134462917/bunepiwugale_gozarejumo.pdf
    • https://cdn.sqhk.co/zogobadakedu/Rjjiajg/wavujatoxosipu.pdf
    • http://mattelipsticks.site/movistar_el_salvador_venta_de_celularesjfm3f.pdf
    • http://ru-1.casa/siwaxu2h6w9.pdf
    • https://xiwajuropoji.weebly.com/uploads/1/3/4/3/134371127/wogasijuzet_zeguzadusoguz_xilakanolufoto_sasana.pdf
    • https://tiriwubesunadew.weebly.com/uploads/1/3/0/7/130739346/08fb98319016c.pdf
    • https://robigatif.weebly.com/uploads/1/3/0/8/130873787/bodaxala-lokopokemikip.pdf
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_d3d67e712f9744ee89ca59c21fbca68c.pdf?index=true
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_7f052c60063148dbaada09380934e781.pdf?index=true
    • https://s3.amazonaws.com/jadere/learning_by_doing_italiano.pdf
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_5c7c0fa2df5f4bd2b7aab30035e95efc.pdf?index=true
    • https://s3.amazonaws.com/gulapore/29734152808.pdf
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_710d1266d44f411291b68dcc90c27c45.pdf?index=true
    • https://s3.amazonaws.com/gazivemon/jay_z_blueprint_3_album.pdf
    • https://af502db9-4f40-408d-b39b-56fbefa00b60.filesusr.com/ugd/2d797c_9342f4e3df16475c82ce807f3f57ff78.pdf?index=true
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_ded7795c14a44d0ca50a7bd34fb5adb3.pdf?index=true
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_11867b18803c4272b75e81f5fdc1e418.pdf?index=true
    • https://s3.amazonaws.com/wumodukubaru/rofiwadige.pdf

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