Malicious PDF — malware analysis report

Static analysis result for SHA-256 f009f90f6dee55ec…

MALICIOUS

PDF

91.9 KB Created: 2021-03-21 10:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ac54d09d6655d2640d593bec26f1ded SHA-1: 7b264c5bf0090fb9626028df9e8c7a4857363ad1 SHA-256: f009f90f6dee55ec588855194de4ed97587f762988806d634481557c557e2da7
184 Risk Score

Malware Insights

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

The PDF file contains multiple external links, with one pointing to 'jumiwimov.ru', which is flagged as suspicious. Heuristics indicate a 'PDF_SEO_LINK_FARM' and a 'PDF_URI', suggesting the document is designed to host a large number of external links. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics further confirm its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jumiwimov.ru/award?keyword=occupational+outlook+handbook+pdf+download
    • http://bibuzikufaje.mygamesonline.org/dymo_letratag_label_maker_ink_refill.pdf
    • http://gekalam.22web.org/lurepezudagejabukorafud.pdf
    • http://fasoxuxesatilu.sportsontheweb.net/27538853557.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/79e109fa-3fbb-49c9-b353-450014e4cabf/how_many_magic_tree_house_books_are_there.pdf
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_511b0deca7c1412b93d619ddd2cbc2d7.pdf?index=true
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_3a743f4c6c244c02b4be1f6e3989659f.pdf?index=true
    • http://kevawiposiwa.rf.gd/usps_vj_tracking.pdf
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_c10a79a13104475ab9e872237c6be2a1.pdf?index=true
    • http://wegexaluda.epizy.com/pizudoxavofaket.pdf
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_f04e62b141f14814b49eaf852f2df713.pdf?index=true
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_7c6f9c06ee23428f9ed8aa169797b064.pdf?index=true
    • http://paguxesij.myartsonline.com/guess_the_word_level_719.pdf
    • https://uploads.strikinglycdn.com/files/041b308d-e985-4cff-abe1-a4436661001d/40704395473.pdf
    • http://xanojeja.rf.gd/46317749499.pdf
    • http://nitovotiroxe.epizy.com/angular_5_to_6_upgrade_guide.pdf
    • https://uploads.strikinglycdn.com/files/c3b6b939-aa6c-47bc-b98c-3b8084329b06/nafadoragugewijefa.pdf
    • https://uploads.strikinglycdn.com/files/b7765774-44d0-405c-9237-b0b85bb98530/17534051605.pdf
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_aa31d817daa34c82b6198a1a01049182.pdf?index=true
    • http://mutifesojare.epizy.com/calculate_deformation_from_strain.pdf
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_85ea38990c7b4055bba8b43a4a76b7ca.pdf?index=true
    • http://fimomisuv.rf.gd/suwojodogomogonufi.pdf
    • http://wefofumerari.rf.gd/auto_start_app_android_9.pdf
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_e56502ca54fb4da8ace54ebbdcee45ec.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_off00012897.bin
1901154408dd0019c49b5f6778f4b2f475cbd9fd43d011a4f9f3e8c358785d6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12897 5292 bytes
font_01_sfnt_off00013aa3.bin
8fff4a59f7bf4913b44649f818034ffc1d0b8dfc4f58e69560e7c3cf63ea70d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA3 11424 bytes

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