Malicious PDF — malware analysis report

Static analysis result for SHA-256 317278aa1aa8d4b4…

MALICIOUS

PDF

61.1 KB Created: 2021-06-10 08:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f8cf3df3d2ed6a26232339e1443e160 SHA-1: dd170c52ab19351295aae7f4ad2a51746c4c1785 SHA-256: 317278aa1aa8d4b47c9328ddddf618e4352a53d9302046501f82bf575624e0a3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified as a link farm, with the primary URL suggesting a lure for software downloads. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6079

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
  • 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://infrive.ru/pbw?utm_term=dreamweaver+portable+cs3+download
    • https://cdn-cms.f-static.net/uploads/4401994/normal_6047b9fb41152.pdf
    • https://bumujonawomete.weebly.com/uploads/1/3/4/4/134435367/15fbb1.pdf
    • https://xidekazepo.weebly.com/uploads/1/3/0/9/130969591/gopiwogejiro-bejogenaxitilif-sexiwuzipewa-dewutivap.pdf
    • https://cdn-cms.f-static.net/uploads/4450248/normal_6025f04247b33.pdf
    • https://kuwisuzom.weebly.com/uploads/1/3/4/0/134017610/5669975.pdf
    • https://telutifezidawu.weebly.com/uploads/1/3/4/6/134624569/vizelobifezajut-bufuguz-ponipaxezet-mixenevad.pdf
    • https://fixalurona.weebly.com/uploads/1/3/4/3/134314544/katitenexizuxix_moniwabud_sasavebovoj_pebupu.pdf
    • https://kagilomit.weebly.com/uploads/1/3/4/6/134669997/582274bcb970.pdf
    • https://xalidanazate.weebly.com/uploads/1/3/6/0/136082238/0bde9b.pdf
    • https://pukewuvidepuf.weebly.com/uploads/1/3/4/3/134321324/438505.pdf
    • https://cdn-cms.f-static.net/uploads/4473916/normal_6044df40715c5.pdf
    • https://lutapusudifo.weebly.com/uploads/1/3/1/0/131070527/7055884.pdf
    • http://rujuboxu.pbworks.com/f/bizuta.pdf
    • http://biduzoku.pbworks.com/f/39067508786.pdf
    • http://papoxuva.pbworks.com/w/file/fetch/144897816/dadurenusetoxagefosisi.pdf
    • https://uploads.strikinglycdn.com/files/03517c75-bc1a-427f-a275-3510e89ffb66/why_is_my_broan_range_hood_blinking.pdf
    • https://uploads.strikinglycdn.com/files/e0c59764-7b04-4a55-8c39-74771bcb228a/90797963747.pdf
    • http://fatakalewene.pbworks.com/w/file/fetch/144499884/favimarebifefokinenofeb.pdf
    • https://uploads.strikinglycdn.com/files/59079e26-1a0b-417b-a53a-56376166b5b3/75544972231.pdf
    • http://sakulibur.pbworks.com/f/wivufebuturivevakesap.pdf
    • http://buzivevej.pbworks.com/f/among_us_mod_menu_always_imposter_pc.pdf
    • http://fepewuwakow.pbworks.com/f/american_heart_association_acls_pretest_answers_2015.pdf