Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ccd26790f607e3…

MALICIOUS

PDF

82.2 KB Created: 2021-03-03 07:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4806087d2d71333a12c46406dde8df1d SHA-1: d0b172eedce182173d5df0ac92978ac25fe31452 SHA-256: 41ccd26790f607e34ecd8837f4f3c774bece575c87b4bedb127a3576306ebfc4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'dugedepap.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/strik?utm_term=sony+bdp-s1500+region+free+blu-ray+dvd+player PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502511/normal_60236887df7d7.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/holt_mcdougal_algebra_1_common_core_teachers_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379369/normal_60001c9976194.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/939482768325bn61.pdfIn PDF document text
    • http://maretexojud.66ghz.com/43136884015.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/si4hgig/entergy_new_orleans_outage_phone_number.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://sidiwen.epizy.com/magugojatelovodevefagep.pdfIn PDF document text
    • http://badamowafe.onlinewebshop.net/63798817305.pdfIn PDF document text
    • http://guneginumo.rf.gd/62_europe_after_ww1_map_answers.pdfIn PDF document text
    • http://fosekor.epizy.com/17606779843.pdfIn PDF document text
    • http://tinuzutajalik.epizy.com/acura_rl_transmission_problems.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_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 5764 bytes
SHA-256: 5e8ce4c75e7c230056af275f97872b9ec30bbf25c90891fe33f466e799895b2d
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 10616 bytes
SHA-256: 4f610a624ffc53cc0bb28c39ea38ce4e484c5dfdf6af8952e3db8e6b0065218c
font_02_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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