Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33fdd16b4fa17b3…

MALICIOUS

PDF

83.0 KB Created: 2021-03-17 01:17:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f755829c3a0d18ffd3206c276c3f265f SHA-1: e2f46c56b1208ec217d96f0f4992fbb6000c5ffd SHA-256: e33fdd16b4fa17b3f983204d309f29863ae5aeb42f69642a316e4332fef4d2d6
156 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 it as a "PDF_SEO_LINK_FARM" containing 30 external PDF links. The primary URL, https://jumiwimov.ru/award?keyword=cds+exam+pattern+pdf+download, suggests a lure to download exam-related documents. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://jumiwimov.ru/award?keyword=cds+exam+pattern+pdf+download
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/4544113.pdf
    • https://static.s123-cdn-static.com/uploads/4448323/normal_5ff59f8d0d6d1.pdf
    • https://fanejutasoja.weebly.com/uploads/1/3/5/3/135399707/sezajigutafid.pdf
    • http://xamagexezuloku.iblogger.org/how_to_remove_magic_chef_stove_top.pdf
    • https://static.s123-cdn-static.com/uploads/4426543/normal_5ff9b91322502.pdf
    • https://static.s123-cdn-static.com/uploads/4459180/normal_60089d0ae49c1.pdf
    • https://cdn-cms.f-static.net/uploads/4377912/normal_6038571c6da22.pdf
    • https://vinaribibivo.weebly.com/uploads/1/3/1/8/131871854/4d34f.pdf
    • https://cdn-cms.f-static.net/uploads/4377391/normal_601cec5eb2c56.pdf
    • https://likemopulijufo.weebly.com/uploads/1/3/0/7/130739197/dokirifuna.pdf
    • https://cdn-cms.f-static.net/uploads/4386852/normal_600a0de306965.pdf
    • https://cdn-cms.f-static.net/uploads/4372383/normal_600f4944dda05.pdf
    • https://sinegozedajosor.weebly.com/uploads/1/3/1/8/131871849/5790194.pdf
    • https://cdn-cms.f-static.net/uploads/4489050/normal_6042d9579ff30.pdf
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fd3af0237f83.pdf
    • http://taxurofetizi.22web.org/66744311568.pdf
    • http://rawokixe.22web.org/brunnstrom_stages_of_recovery.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tezowojisare.epizy.com/saribetujat.pdf
    • http://nakunefizuvodu.epizy.com/multiplication_worksheets_for_grade_4.pdf
    • http://fevepapowiwed.epizy.com/powerpoint_storyboard_template_ppt.pdf
    • http://jefelaxe.epizy.com/animated_background_for_ppt_free.pdf
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_f01c985b40154d4db85902da15f411e4.pdf?index=true
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_46a9ec7218cd41bea585abdc6bfe8dee.pdf?index=true
    • http://fabomisibis.rf.gd/toro_timecutter_cost.pdf
    • http://najaxobefirag.epizy.com/sony_headphones_app_apk.pdf
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_3391a9ae0eff4597b61c129301c05519.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_off0001065c.bin
cf0af1019ab582a17a3e963caca9617efbbdd39a65193213ed04a4215be00dd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 5252 bytes
font_01_sfnt_off00011835.bin
ef3d81453fe02d0784330d8c58d00d1eda53cfb194408da3225ab078693a5344		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11835 11292 bytes

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