Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf754d5f5b1fffd…

MALICIOUS

PDF

72.9 KB Created: 2020-11-20 05:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f0bd0c8c1285e51e30acca3b04a53d4f SHA-1: b962f0de5ceddbf7d479997fb0f01a5199147815 SHA-256: 1bf754d5f5b1fffdf0d1cbfb93192983a0dcbc6abe08ca5ea2db72bbc1c8af8f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links points to 'trafftec.ru', suggesting a redirection or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?utm_term=300+sq+ft+to+m2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415046/normal_5f99a68629f1a.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/famoxurazavew-bawozi.pdfIn PDF document text
    • https://bofazereb.weebly.com/uploads/1/3/4/6/134675062/pigivagolap_kosiganevenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a09d59-623e-4a6d-9206-c0a9a4fd6e3a/hertz_rental_receipts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a88bf3b-89a0-4ca1-a013-4c59232b8c93/suwawaguruxagora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537817d2-81b8-435c-8881-e34e03e83655/gubowuzorumomugopusemosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0707ea3-2d0e-4925-a8e7-ffcf7eacad97/85073301485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b60ae58f-9720-4dfa-9eaf-7f1af8dd37ce/45661026040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b2893a-0d6c-4805-8298-6c5b6d0712f0/51662506693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23561e88-4775-4a5e-b0aa-ab4ed373051f/vakuwiwipowikavozum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b8b8d4-96cf-4d3f-8684-e8faff420738/87622253834.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_off0000c968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 5044 bytes
SHA-256: 22b07463046c65880169dc533d60e1c628f6295a1bfab3a42ae6920166686e3b
font_01_sfnt_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 11252 bytes
SHA-256: d5f8fb8cb2cd92f5da2201df432846151c4d41fb749139d3242f66850f254de0
font_02_sfnt_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 16216 bytes
SHA-256: 7db7e1d3e0eedc841e1d141486b9dadd66e803ab889486df6fa7f9a7b4c1df90

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