Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fac99b1d2899dfc…

MALICIOUS

PDF

54.3 KB Created: 2021-06-01 15:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff06d6a61f6587e08d250c4b709f6b57 SHA-1: 2d3c9e5139d96523d86f1618aa5e861eb05c2039 SHA-256: 2fac99b1d2899dfc7bb150670b1f9eaa4b2bb5dc525eabc17a0581645456d90e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The heuristics indicate it's an image-only lure designed to trick users into clicking an embedded URL, likely for phishing or to download a second-stage payload. The document body is heavily obfuscated, but the presence of external URIs and a link farm suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9535

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 54 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://medvor.ru/pbw?utm_term=how+do+i+check+my+ehsaas+labor
    • https://zezodejesamibiz.weebly.com/uploads/1/3/1/1/131164097/gimozaluripadesas.pdf
    • https://cdn-cms.f-static.net/uploads/4417528/normal_604fcc09b0118.pdf
    • https://cdn-cms.f-static.net/uploads/4408348/normal_601d0500c2113.pdf
    • https://cdn-cms.f-static.net/uploads/4416791/normal_60222482a193f.pdf
    • https://werudugin.weebly.com/uploads/1/3/0/8/130873895/6626087.pdf
    • https://bufigolumixi.weebly.com/uploads/1/3/4/2/134234787/4845484.pdf
    • https://cdn-cms.f-static.net/uploads/4420034/normal_606bf789de4ff.pdf
    • https://gebigimudixerez.weebly.com/uploads/1/3/4/3/134374499/af7b6360c.pdf
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/pagafuki.pdf
    • https://static.s123-cdn-static.com/uploads/4425256/normal_5fcb3256d479d.pdf
    • https://katebobuwusa.weebly.com/uploads/1/3/1/3/131384636/fudilexovuk.pdf
    • https://sezijaxafiv.weebly.com/uploads/1/3/1/6/131637080/8475021.pdf
    • https://gozarijaleb.weebly.com/uploads/1/3/4/3/134337750/puzawag_lixaxaxejipizav_saziso_koxulamenav.pdf
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/rojeno.pdf
    • https://uploads.strikinglycdn.com/files/9b284723-84b7-4425-9c6b-2316d5566b67/bubuje.pdf
    • https://uploads.strikinglycdn.com/files/835c06f3-631e-4eee-bf56-7e58328e4f5a/43023914935.pdf
    • https://uploads.strikinglycdn.com/files/f42fce93-c565-42b0-bc24-0341814cda69/162009238.pdf
    • https://uploads.strikinglycdn.com/files/1cc61d11-e62a-47f4-a495-3a138fd71161/sat_test_dates_and_locations_2020_covid.pdf
    • https://uploads.strikinglycdn.com/files/9166fddf-ccbd-4921-adee-ffdc4acc43a6/kexinafiginijitipogox.pdf

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