Malicious PDF — malware analysis report

Static analysis result for SHA-256 51329faf3b3862ab…

MALICIOUS

PDF

48.4 KB Created: 2021-06-15 12:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fe7d9c94287928c2fddf679c52eed6ce SHA-1: 42a6d6a3c81c3b59f65f298292e16a0333089cac SHA-256: 51329faf3b3862abffe0e48b6dfd1ef6886d215ade92278be6ab124e0509b2f4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The primary URL, https://nomylo.ru/pbw?utm_term=letest+sexy+mms, suggests a lure related to 'sexy mms'. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or distributing unwanted content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://nomylo.ru/pbw?utm_term=letest+sexy+mms PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367648/normal_601dd30f3067c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_60074f5246d6e.pdfIn PDF document text
    • https://ligefunodimab.weebly.com/uploads/1/3/1/3/131398292/9910040.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414678/normal_5fe32d560bc67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475204/normal_6007e3e241469.pdfIn PDF document text
    • https://mosatidopo.weebly.com/uploads/1/3/4/7/134731439/f4333e0ed56b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415929/normal_60bcd55bc3929.pdfIn PDF document text
    • https://sulogaxelope.weebly.com/uploads/1/3/1/4/131438888/jidibuzolexupi_mopidore.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/f/76973584400.pdfIn PDF document text
    • http://lerutokib.pbworks.com/f/77709231000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96ccf7e-a714-44d5-a45c-e50539d8d066/what_is_manual_on_a_pressure_cooker.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/144739512/ratubidelawigaxumewafaxu.pdfIn PDF document text
    • http://goferupemo.pbworks.com/f/the_final_destination_5_full_movie_download_hd_bluray_dual_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5210e9c0-5c72-4a40-9af4-39bfb5b6ddf0/leon_comparaison_des_nombres_ce2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e218dd4-83bf-43cb-9a66-fd140210d34f/xofovofugatumotaxed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b2e242-1b59-416c-b5bf-624d561bd240/newtons_first_law_of_motion_definition_and_examples.pdfIn PDF document text
    • http://fisagibop.pbworks.com/f/wajilaxebakivusulekepuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f53e5b3-c14b-4736-9f38-b3c6d0e41402/94939746997.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/145216134/12062760674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ccdd5d-2971-4a4b-b47f-2cb984b5088c/zuzofomevuboxebufewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef455b9f-1100-4efd-9615-818d78e85ee2/th_pronunciation_activities.pdfIn PDF document text
    • http://kuxuraroj.pbworks.com/f/19820758371.pdfIn PDF document text