Malicious PDF — malware analysis report

Static analysis result for SHA-256 2311e82d3ef8273a…

MALICIOUS

PDF

70.4 KB Created: 2020-12-14 10:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5d61ef5c90a592d76904fa49166b3377 SHA-1: 443be2922dd73b510ec726974bc47844e8949276 SHA-256: 2311e82d3ef8273a8578451713c2d8083cccc6c71a9cbdcffdd6c8ce7be9c680
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a PDF redirector link pointing to 'gettraff.ru'. Another critical heuristic identified it as a PDF SEO link farm, containing 22 external PDF links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://gettraff.ru/wb?keyword=avery%20label%20templates%20l7173 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4484624/normal_5fa8065559315.pdfIn PDF document text
    • https://sotalopi.weebly.com/uploads/1/3/4/3/134345355/6429332.pdfIn PDF document text
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/1998084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5f8b598700ac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_5f9a78c20c281.pdfIn PDF document text
    • https://zogerosolubelu.weebly.com/uploads/1/3/4/5/134576434/tazinag_bipolob_tozitepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_5fd1c4aa88893.pdfIn PDF document text
    • https://kotesolowineb.weebly.com/uploads/1/3/4/4/134448376/2488904.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/farezelof/bivofelalomiwabirojunef.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54fb7403f5353fdb2d39b/t/5fcf54890ff3944fc5582e0c/1607423113871/orange_tree_golf_club_orlando_florida.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf586e5147b148042a623a/1606375536811/get_out_of_jail_free_card.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF1 5552 bytes
SHA-256: 4cc38adeb86949f0d596a077b61466f2ac7d46597b189ef758c684ad12ea96d6
font_01_sfnt_off0000d0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D7 11360 bytes
SHA-256: a56a9dbdd723a274bd50332842aa9db22ddf52a1e136285a95737d6ddfc54ecc
font_02_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 16176 bytes
SHA-256: 9f4914eee661b0ee52b7d56f83ca1c0c111f1c5d0cc5f10efe511803eb69212c

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