Malicious PDF — malware analysis report

Static analysis result for SHA-256 a468b1894e97cb4c…

MALICIOUS

PDF

75.3 KB Created: 2021-02-15 12:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4aa8c8da68bd824dc5c1bd539dccf727 SHA-1: 461b260085821a4b874d54e75dd30835946c5cbe SHA-256: a468b1894e97cb4c330254714730ca66795b8bf9acd3002389233dfa8808ce07
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, with one specifically pointing to a link farm designed to redirect users. The document body, though heavily obfuscated, appears to contain metadata related to wkhtmltopdf and a date, suggesting it was generated programmatically to serve as a lure. The presence of many distinct hosts and disposable hosting indicates a campaign focused on distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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
  • 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://leonvi.ru/wb?keyword=mercruiser%205.0%20oil%20filter%20location PDF link annotation
    • https://cdn.sqhk.co/jugomuzuteb/fDZOkOp/2624708288.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/byijgjh/download_subway_santa_princess_runner_apk.pdfIn PDF document text
    • http://jexemukanofefoj.iblogger.org/xunowugig.pdfIn PDF document text
    • https://kixivoveluvib.weebly.com/uploads/1/3/0/7/130775150/xinodugikor-bilegajopages-dubuxoropawix-safuginalivevi.pdfIn PDF document text
    • https://magazeja.weebly.com/uploads/1/3/5/9/135990405/merez_lepolugelekomiz.pdfIn PDF document text
    • https://dezirivudamowi.weebly.com/uploads/1/3/1/8/131856369/fizas_kuxokizebepadef_vaseximitosi_zuwagiteke.pdfIn PDF document text
    • http://nesobaka3.xyz/active_and_passive_voice_exercises_present_tensem0ruw.pdfIn PDF document text
    • http://slmit.fun/diamond_free_fire_murah_via_id9yfk9.pdfIn PDF document text
    • http://zarabatyivat.ru/peropumexizukarogegenn3nc.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/fiaIohc/25563760163.pdfIn PDF document text
    • http://wowit.pro/blank_handwriting_sheets_ks1ozzlv.pdfIn PDF document text
    • https://tesafugefiwa.weebly.com/uploads/1/3/5/3/135318727/xanajuzu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kutoduno.rf.gd/75566222519.pdfIn PDF document text
    • http://bumevibil.epizy.com/69198251912.pdfIn PDF document text
    • http://javisan.epizy.com/gilufej.pdfIn PDF document text
    • http://pasadoru.epizy.com/34813437244.pdfIn PDF document text
    • http://dovovefuwaxav.epizy.com/vesozilivuv.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_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 5176 bytes
SHA-256: 469b5ae83c22197cbb57fdbab7adbd219fba5f6b50bdacfdb6c7bf5357abb486
font_01_sfnt_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 10728 bytes
SHA-256: ea526b1368e41927e4d7777b89744dc5445f08096319952e16c701124ff4efa4

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