Malicious PDF — malware analysis report

Static analysis result for SHA-256 85584d81d637e512…

MALICIOUS

PDF

40.8 KB Created: 2021-03-11 03:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4afd581e4218dbaf25a4c57616aae1e8 SHA-1: 34b15b24d9bcc1095e49b309f3759b9a9e93b2ce SHA-256: 85584d81d637e512e14500c93638f5c80ec2d68705d793e867fd68c2ec733f2a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide clickable links. It contains numerous external links, including one pointing to 'xajibur.ru', suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8113

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
  • 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 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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/award?keyword=filehippo+pdf+compressor
    • https://cdn.sqhk.co/pigajifaw/PUhdhim/brothers_a_tale_of_two_sons_cooperativo.pdf
    • https://xawupaxov.weebly.com/uploads/1/3/4/6/134699297/7606575.pdf
    • http://sezunerop.iblogger.org/does_anyone_die_in_crooked_kingdom.pdf
    • https://cdn.sqhk.co/pawekenu/tifZhaF/lexif.pdf
    • https://cdn.sqhk.co/vumusokutil/CpxRkid/4540400453.pdf
    • http://zifujujefilat.iblogger.org/fast_secure_vpn_for_android.pdf
    • https://lafetewefovizav.weebly.com/uploads/1/3/4/3/134385578/7238396.pdf
    • https://cdn.sqhk.co/xagaxubibiz/iiavWlm/futifefelup.pdf
    • https://woniwisupu.weebly.com/uploads/1/3/4/2/134266019/rudijujaxokijek_lolazetofak.pdf
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/zoned_joluzavelije_meroxep_magep.pdf
    • http://tapadobav.iblogger.org/bernina_deco_340_user_manual.pdf
    • http://poxemibusap.epizy.com/41424012469.pdf
    • https://s3.amazonaws.com/gekojulog/peluronizofibuguku.pdf
    • https://uploads.strikinglycdn.com/files/f1e9525d-851f-4f41-a6c4-67c36d640639/nikon_n8008_battery.pdf
    • http://mafikaxavetubod.rf.gd/accounting_standards_2018.pdf
    • https://uploads.strikinglycdn.com/files/8af96dbb-553d-4a80-badd-2968c0478c20/kafevoponipalijigej.pdf
    • https://s3.amazonaws.com/dotivaf/what_is_ethics_in_sport_management.pdf

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