Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afdb837e1ad004a…

MALICIOUS

PDF

37.6 KB Created: 2021-04-07 13:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c17a8e68ad1254d33eeba06bf4a6eb32 SHA-1: fab33afe46de55b291385d28088d67c6e421f94d SHA-256: 3afdb837e1ad004aab2beb4baa11094325f8e075a97504828e53089f003ce3c4
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and a hidden click-out action, typical of a screenshot-based scam. It contains numerous embedded URLs, including one that appears to be a search query related to medical testing, suggesting a pretext for the user to click. The ClamAV detection and ML classifier further support its malicious classification, indicating it likely leads to a malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6328

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 37 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://gimoguvi.ru/aws?utm_term=how+to+get+tested+for+sleep+apnea+without+insurance
    • https://cdn.sqhk.co/kigimole/1ghgeAR/syberia_1_2_nintendo_switch.pdf
    • http://zarumesa.mypressonline.com/viwatabuzalag.pdf
    • https://fanuwatesovize.weebly.com/uploads/1/3/1/3/131380837/277803.pdf
    • https://ninuxegomozul.weebly.com/uploads/1/3/1/8/131871835/69658.pdf
    • https://cdn.sqhk.co/ralapogifur/eicjgL8/92900396095.pdf
    • https://cdn.sqhk.co/vidikusupegu/KYlgdAr/thief_city_all_loot.pdf
    • https://cdn.sqhk.co/runudori/8jbMNRL/lelarujujeraniroxix.pdf
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/lefowi.pdf
    • https://cdn.sqhk.co/rupomotiz/hAlmyhi/8_bit_music_maker_download.pdf
    • https://s3.amazonaws.com/kugelilizibuwum/crash_bandicoot_pc_2.pdf

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