Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4cf8e401771a27…

MALICIOUS

PDF

62.4 KB Created: 2020-12-09 10:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 549f530028aba642e077c96aa4b0157f SHA-1: e26983c32a2811aef31c73d0d7e2878e0cc20a63 SHA-256: 4a4cf8e401771a27be2787a952b7625791ccfcfd4df43349785c00d86c10029b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by multiple critical heuristics as a malicious redirector and link farm. It contains numerous embedded URLs, with a primary one pointing to a known malicious redirector. The ML classifier and ClamAV also strongly indicate maliciousness, likely related to phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ggtraff.ru/strik?utm_term=weather+radar+battle+ground+wa In PDF document text
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/8057033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_5f8cb90e3624d.pdfIn PDF document text
    • https://maritomumotoko.weebly.com/uploads/1/3/4/5/134512683/9f8d8530a9e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_5f8db32adacbe.pdfIn PDF document text
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/8303341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_5fa08723e6594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_5fac357eb98ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_5fb25c6a72447.pdfIn PDF document text
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/4117077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_5f91b70425be0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_5fc13cc0575e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/84889706738.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/38966515395.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc368e8c6229360ecbce8a9/t/5fc514259b1ed035387e0727/1606751269478/yamaha_ypg-235_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc38c0cea4a794d5655cf02/t/5fcb7af4393ce4735633f4d2/1607170805597/star_traders_frontiers_guide_best_ship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926ead22-062e-40e8-8be1-f0ed24927247/62298350297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0a514c-a8dd-4c79-aad1-66fb6eee8d8e/66266392860.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89B 5156 bytes
SHA-256: c589c547ee26b7f5b6f45590b2fbd2ba45d1a0d1a633b7bfd3358bcad676d84e
font_01_sfnt_off0000ca33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA33 10104 bytes
SHA-256: 303d3b239137ec464268806a353bea8e1fd2b9c76317e38f83ca45558bede4c9

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