Malicious PDF — malware analysis report

Static analysis result for SHA-256 264ca57b5de4bbda…

MALICIOUS

PDF

82.8 KB Created: 2021-04-16 16:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1efa27b3c657455d921b4fcbf3ef46e0 SHA-1: 22fd93c82478d2e7569e20c942a44430cb0ef8bf SHA-256: 264ca57b5de4bbda80d9a84099f12c34fe04915d7ca972c33a6d43e64aa5539d
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically leading to a suspicious domain ('lozipotod.ru') that is part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

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
  • 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://lozipotod.ru/strik?utm_term=how+to+find+area+of+irregular+trapezoid PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422386/normal_5fee9a3fe7de1.pdfIn PDF document text
    • https://dajilifu.weebly.com/uploads/1/3/4/8/134891154/5247581.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/7902806.pdfIn PDF document text
    • https://rixemovupel.weebly.com/uploads/1/3/1/6/131606965/6581951.pdfIn PDF document text
    • http://jafalule.22web.org/xagufuvubusoforikasinan.pdfIn PDF document text
    • https://vuguzunorofina.weebly.com/uploads/1/3/4/3/134322364/6000005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_60317890b7b48.pdfIn PDF document text
    • http://turuluwugebig.22web.org/libepibogevefedegeboj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dinelak.rf.gd/nobatomukigose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a09c513-a66b-4719-bf20-aa590038c72b/how_can_i_eat_2600_calories_a_day.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82cb0c67-5e76-4c9f-9e48-a5e9e09e5ef9/super_mario_land_2_dx_rom_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9783cb26-a2cd-45a9-bf39-5c4b3bc99d3f/samsung_un55js7000f_manual.pdfIn PDF document text
    • http://wibelatape.epizy.com/25727318513.pdfIn PDF document text
    • http://vopimivukaf.epizy.com/food_brochure_templates_online.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_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 5132 bytes
SHA-256: 2cabc0fe2ab7abaf6007fa9d65382b7046418a6f78ababdaf98bafbfa3e09e8a
font_01_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 12540 bytes
SHA-256: 723544587009b756e32082c2390b582fd80995571d580e672f86ce930fd3e6ae
font_02_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 16116 bytes
SHA-256: 4277bff29f8b911d623ba112f56621b4047493f2ce808953810f85836f11db58

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