Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44f828a623f50bc…

MALICIOUS

PDF

47.0 KB Created: 2021-01-04 17:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78390e190795429b3e843b91bf262957 SHA-1: 7528cc0308c39fc9549324e60c1eb836945159e9 SHA-256: f44f828a623f50bca2c768b39a635328e6ca6b8d7d70a8207a821ce6f7800beb
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot hides a malicious trigger. The presence of numerous external PDF links, as flagged by 'PDF_SEO_LINK_FARM', suggests an attempt to generate traffic or distribute further malicious content. The ML classifier and ClamAV detection strongly support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9327

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 47 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://trafffe.ru/123?utm_term=sitting+waiting+wishing+guitar+lesson
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/815f676cdca5.pdf
    • https://wuzubetimu.weebly.com/uploads/1/3/4/2/134266391/a0bc952ecb27d.pdf
    • https://cdn.sqhk.co/xezojutatow/eKThgjh/ball_red_mystery_island_in_fire.pdf
    • https://cdn-cms.f-static.net/uploads/4383128/normal_5fd682a4745c6.pdf
    • https://cdn-cms.f-static.net/uploads/4410448/normal_5fb4cb7462484.pdf
    • https://cdn.sqhk.co/lituxopevuk/CTijdDv/arknights_twitter_authorization_failed.pdf
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/cb7f6d77dab06.pdf
    • https://cdn.sqhk.co/telivagawu/zghichd/98587595377.pdf
    • https://pinoxelu.weebly.com/uploads/1/3/4/1/134108818/6c1ff.pdf
    • https://cdn.sqhk.co/zowesifona/m9rghZG/68138512936.pdf
    • https://ranuregobaxamig.weebly.com/uploads/1/3/4/8/134889764/3286187.pdf
    • https://s3.amazonaws.com/matogapibelifiv/namizadavakewanivovur.pdf
    • https://s3.amazonaws.com/wexoteluwag/xivikarego.pdf
    • https://s3.amazonaws.com/leguvefu/instrumen_penilaian_akreditasi_puskesmas_2018.pdf
    • https://s3.amazonaws.com/zonebon/crossword_puzzles_elementary.pdf
    • https://s3.amazonaws.com/jedobufudajewu/emergency_reporting_regional_training_academy.pdf
    • https://s3.amazonaws.com/gelawiweza/lunenitovowixezikimudasas.pdf

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