Malicious PDF — malware analysis report

Static analysis result for SHA-256 c548bd0493e8183d…

MALICIOUS

PDF

76.7 KB Created: 2021-02-26 21:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 51b9b5f4777b12d1e6a325cceb94e54c SHA-1: 6690ae046e654586b9e340394ca7dd4a95e3b5ec SHA-256: c548bd0493e8183d3edb68d562778da87ac3b66851a4431c2330310f13faf9bb
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least two identified as pointing to known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to film search terms, likely designed to drive traffic to these malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=where+is+the+film+waiting+for+the+barbarians+set In PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_600d168cdda1f.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/hZiaifE/97130532596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418991/normal_5fd348b766bd3.pdfIn PDF document text
    • http://citimart.online/39103379904gj9tr.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/QicrLpJ/verizon_cloud_restore_failed.pdfIn PDF document text
    • http://ukrinsure.com/78534490470dycyi.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/gghZisa/halloween_party_themes_for_tweens.pdfIn PDF document text
    • http://ver-alex.website/habitat_acropora_formosa6t7q6.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/xutedirokeruxas.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/XeidDgh/xalofuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_5fdc4936eeb15.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/hf3ijbq/36353787147.pdfIn PDF document text
    • http://topcreditreport.info/pibotilazasipop3tl81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fobupozomorefiw.epizy.com/89558337943.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/what_is_the_best_food_saver_vacuum_sealer_to_buy.pdfIn PDF document text
    • http://kojeziponoduv.epizy.com/guwitededox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 5216 bytes
SHA-256: 558a638c91e49158634f9a1c277981fcbbe985423802b72b8647ad02bc070733
font_01_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 11104 bytes
SHA-256: 6ccfd78fb5cda9c28171678fc4f7c27fc4807b0f41c42d5fd14546fe57b27ec5
font_02_sfnt_off000116fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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