Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26ff4a6dc00e64c…

MALICIOUS

PDF

74.0 KB Created: 2021-03-23 05:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 643eb639c41ddb2e4026d57d13a87828 SHA-1: e4be2c7fe4bc714bc36d1a949f5db6f1a2006daf SHA-256: c26ff4a6dc00e64cd0bfc6f0053b8fd55784873db5368d224fea451f6f2ac8b4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm with numerous external PDF links, including one disguised as exam questions, likely intended to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lozipotod.ru/wix?keyword=property+law+exam+questions+and+answers
    • https://static.s123-cdn-static.com/uploads/4464327/normal_5fe5b15a56d42.pdf
    • https://cdn-cms.f-static.net/uploads/4446399/normal_6013f4637e57c.pdf
    • https://cdn-cms.f-static.net/uploads/4481161/normal_6033026f8e180.pdf
    • http://jomavuporu.22web.org/what_is_inferential_statistics_research_design.pdf
    • https://rijemozedez.weebly.com/uploads/1/3/1/4/131407135/wunegofo_tunajuto.pdf
    • http://kuwufusef.22web.org/brother_mfc_j5910dw_maintenance_menu.pdf
    • https://davixiwawelugez.weebly.com/uploads/1/3/4/1/134133028/e6cdf9005e4.pdf
    • https://cdn-cms.f-static.net/uploads/4501486/normal_604336a3bea9a.pdf
    • https://mokenexub.weebly.com/uploads/1/3/4/4/134478104/pazotujigapisotumew.pdf
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fcb77ed4f322.pdf
    • https://kutufexefe.weebly.com/uploads/1/3/4/6/134695169/0f31beca2177d9.pdf
    • http://merutakozuxonu.22web.org/92783269831.pdf
    • http://lisolosesisav.22web.org/21376675237.pdf
    • http://taxurofetizi.22web.org/riparian_zone_management_guidelines_tp148.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/feborobegibew/28457356365.pdf
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_d411b2585e8c4afbb152ebaebcf35bee.pdf?index=true
    • https://s3.amazonaws.com/guxosa/how_to_install_fuzzy_lookup_in_excel_2013.pdf
    • https://ce722411-b424-48ee-ac00-b4ed8818edd9.filesusr.com/ugd/bff0de_a3aa8a37838a40a5a9b881bb5fa7ad79.pdf?index=true
    • https://s3.amazonaws.com/kosamupim/25220235372.pdf
    • http://xumugipetoje.epizy.com/musharaf_bangash_audio_songs_free.pdf
    • https://s3.amazonaws.com/tiduro/uil_listening_skills_practice_tests.pdf
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_7e049a7271974fd1ae0a60e690c36a19.pdf?index=true
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_9a558beafa5b4384ae42cc894a8235a1.pdf?index=true
    • http://pobifewudej.epizy.com/23476514550.pdf
    • https://s3.amazonaws.com/sitozi/cyberghost_vpn_for_windows_7.pdf
    • http://bosurigazo.epizy.com/17926129319.pdf
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_471d8fa67d0e4fe6b05745efef80dc15.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_off0000e216.bin
1b36dfa4b9ae902fd05ecbb7bff65d7caada3ef640eb4dc423904129c689cac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 5492 bytes
font_01_sfnt_off0000f4c3.bin
8f8a2f58c8c3443b8ce3a5b593aae54933557049c4fa14fac40d6354b049a402		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 11096 bytes

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