Malicious PDF — malware analysis report

Static analysis result for SHA-256 15acb0dea39bb6fa…

MALICIOUS

PDF

73.0 KB Created: 2020-12-14 19:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72dd6f77ba27741b27c66b1bdbdaa318 SHA-1: 7920c4d3c24df58fc6e34462347edec413879afa SHA-256: 15acb0dea39bb6fa79169c5947794b835af0662344bb3ccc49bd3fdda33e1da5
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains multiple external links, one of which is a known benign PDF, but another points to a URL that is likely part of a link farm designed to distribute further malicious content. The presence of a 'download button' heuristic suggests a lure to trick users into downloading additional malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/123?utm_term=remington+1900+double+barrel+shotgun
    • https://cdn-cms.f-static.net/uploads/4382643/normal_5f9e8eff0eb19.pdf
    • https://static.s123-cdn-static.com/uploads/4450356/normal_5fcd603da8115.pdf
    • https://static.s123-cdn-static.com/uploads/4408586/normal_5fcf852f42599.pdf
    • https://zabemukud.weebly.com/uploads/1/3/4/6/134614305/jijaxezem.pdf
    • https://cdn-cms.f-static.net/uploads/4487208/normal_5fd2d474d9ff6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nedijowewoded/excel_sheet_not_scrolling_right.pdf
    • https://s3.amazonaws.com/fapaga/98401108610.pdf
    • https://s3.amazonaws.com/sugaguxagu/guxiziput.pdf
    • https://uploads.strikinglycdn.com/files/e7c38337-34e1-4805-9aaa-9d3f8185e7d6/getukajakuzamat.pdf
    • https://static1.squarespace.com/static/5fc0abc6bda9c57a97bd16fd/t/5fcf844657846c5b835938c1/1607435337792/naturalizer_heels_sandals.pdf
    • https://s3.amazonaws.com/pozokimepe/53341669879.pdf
    • https://s3.amazonaws.com/muvazi/32944251234.pdf
    • https://s3.amazonaws.com/zarelusipofox/dalun.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd14b912cb2817442fde26/1606227129928/zanti_pro_mod_apk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1ae.bin
fdeca7b427725aae3ec7a7da78068e43e84586dfd6985be0e14f678a6b7f67c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AE 5616 bytes
font_01_sfnt_off0000e48c.bin
b3d2b605e8a49815e3693d26806767e121c34ebd3b8c6eda8e59d58020f7721e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 10556 bytes
font_02_sfnt_off000108b2.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 4324 bytes

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