Malicious PDF — malware analysis report

Static analysis result for SHA-256 72df9d69a88e7378…

MALICIOUS

PDF

73.3 KB Created: 2021-02-20 23:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c076eb10f492b6f172b6cfcc45a64817 SHA-1: b073d9fe239a3d6ac772716ae7bb5c0cc8c863b7 SHA-256: 72df9d69a88e73789a84b53ddb6494328c70ed4593c3839e76eae114d1600aeb
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, indicative of a link farm or SEO spam operation. The embedded URLs and the heuristic firings suggest the primary purpose is to redirect users to malicious or spam content, potentially as a lure for phishing or to distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://seumenha.ru/123?utm_term=why+is+life+meaningless PDF link annotation
    • http://pimebujeben.66ghz.com/api_527.pdfIn PDF document text
    • https://nesamakamaxo.weebly.com/uploads/1/3/1/6/131636712/7e5034c2f087.pdfIn PDF document text
    • https://rujuzodojavumip.weebly.com/uploads/1/3/4/7/134726220/sekisilu.pdfIn PDF document text
    • http://daravto18.ru/feeling_good_muse_mp3_downloadgagc3.pdfIn PDF document text
    • https://gosaronazaniga.weebly.com/uploads/1/3/4/8/134851605/6351671.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/hfwl4je/705458680.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/g9sWZVE/race_car_driver_accident_today.pdfIn PDF document text
    • https://dapevorejux.weebly.com/uploads/1/3/4/6/134695165/ef03516979c329.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/vopike.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/dWggYJE/touchdown_manager_apk.pdfIn PDF document text
    • https://munulibur.weebly.com/uploads/1/3/4/5/134508804/3c94e1642.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuzipewas.rf.gd/13225327173.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_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 5200 bytes
SHA-256: 0cebf35173aeedc38be73f6603622566b44d36cf934bfeda2354568bd70f9938
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 10556 bytes
SHA-256: ee67efa4d8697cb8304d31e4781468973b280e0760a83e8fc9d3dddc11329041

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