Malicious PDF — malware analysis report

Static analysis result for SHA-256 3875d9a7b3f18835…

MALICIOUS

PDF

59.4 KB Created: 2021-04-07 21:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16aa17d859e65345a22ac2f64529c6ab SHA-1: d4bab6e548b38a7fd5a045abecce803fd8bdf400 SHA-256: 3875d9a7b3f1883584d376522291006f6c467180cef98477baf02a9aac73bd06
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and is flagged as a phishing lure. It contains a link farm with numerous external URLs, one of which is `https://leonvi.ru/aws?utm_term=why+is+my+generator+not+producing+power`. The document body appears to be a screenshot, a common technique to hide clickable elements that lead to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9093

Heuristics 6

  • 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 59 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/aws?utm_term=why+is+my+generator+not+producing+power
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/gokeg.pdf
    • https://cdn-cms.f-static.net/uploads/4474218/normal_60494cb34b983.pdf
    • https://cdn-cms.f-static.net/uploads/4410432/normal_606d94820a417.pdf
    • https://jojijuwewit.weebly.com/uploads/1/3/6/0/136057333/cfce3bf3ad1cdc8.pdf
    • https://static.s123-cdn-static.com/uploads/4374379/normal_600101f70d109.pdf
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/wepinadifexurijanil.pdf
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5fd2d3445333b.pdf
    • https://fokuxadeji.weebly.com/uploads/1/3/4/5/134585395/9159880.pdf
    • https://cdn-cms.f-static.net/uploads/4455399/normal_604475c730082.pdf
    • https://bakogala.weebly.com/uploads/1/3/1/3/131384254/393fadb71.pdf
    • https://xekobemakisusij.weebly.com/uploads/1/3/1/4/131438823/f696f42f.pdf
    • https://cdn-cms.f-static.net/uploads/4486548/normal_606cc3bd3fa75.pdf
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fc62da1dec72.pdf
    • https://static.s123-cdn-static.com/uploads/4381532/normal_5fcddd3467bf3.pdf
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_58aaae91155346bcb5f8191456bcbe36.pdf?index=true
    • https://s3.amazonaws.com/mojivikapeti/zuwetisimegumosote.pdf
    • https://s3.amazonaws.com/paxunu/91380692444.pdf
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_cfa82460d06349c68bfc4c72b5df30ac.pdf?index=true
    • https://s3.amazonaws.com/jeworurowam/star_wars_ahsoka_show_trailer.pdf
    • https://s3.amazonaws.com/galinikagopit/beamer_template_title_page.pdf
    • https://36ba0bd5-485c-4bd5-924f-6a5e18dcb854.filesusr.com/ugd/96419b_5ec6f4a48950416bafbb07f2eedbe9ec.pdf?index=true
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_50048c9ab74a430d92ee39c3ecbcecf4.pdf?index=true
    • https://65fca3b3-7ce8-4d56-9bc8-ebe46cc5223b.filesusr.com/ugd/f6ed72_ca735664792a4882a65eb01e19696cad.pdf?index=true
    • https://s3.amazonaws.com/woxojuxafopuv/tedegejesawi.pdf

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