Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1e63e190e9f5cc…

MALICIOUS

PDF

80.4 KB Created: 2021-03-17 01:17:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19e601f4d465e261cbcb7cbc9a026bc4 SHA-1: fce35536aab0c37522887e70a36fee2379180733 SHA-256: 8f1e63e190e9f5cc02678ea4431ef72ea468225520bc8995d665dda12cf8fd80
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to other PDF files, suggesting a link farm or a method to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of many external links is a strong indicator of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8058

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://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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