Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abf9e1b1b9beaa2…

MALICIOUS

PDF

139.9 KB Created: 2021-04-08 09:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c8eb1adae5dfd64c74515aca6d026984 SHA-1: c51ef6c65c9a7158040f3b1ea0fbf68e46aea700 SHA-256: 7abf9e1b1b9beaa2a70db52654207cd40107f15813b2150e354fb5b1d88dd575
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to '2003 dodge durango rt wheels', suggesting a lure to attract clicks. The presence of numerous links on disposable hosting further supports a link farm attack pattern, likely intended to lead users to phishing sites or download further malware.

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
  • 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://crophysi.ru/strik?utm_term=2003+dodge+durango+rt+wheels In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416918/normal_603a2de50b880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459941/normal_606a38e011a7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_605d80f2297d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470521/normal_604a614f73e7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_603215b816f3f.pdfIn PDF document text
    • http://sallles.ru/94308340698bwcr9.pdfIn PDF document text
    • http://introdom.ru/zeminebudonisarafugovej0eah0.pdfIn PDF document text
    • http://strita.space/66364051762hj7e7.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulobu/XDgcjhc/fibuwolavudemokawidizemad.pdfIn PDF document text
    • https://cdn.sqhk.co/wabogojo/bVaihgi/23769201805.pdfIn PDF document text
    • http://ersoil.fun/witirijadeb32wg6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413968/normal_5fe726a9eb073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_604dde9ea0b61.pdfIn PDF document text
    • https://cdn.sqhk.co/litawoxelida/abhbv8Z/canary_bird_lifespan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421474/normal_5fdf89677a34d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31df147f-a966-4ba4-856c-1ca1da67d531/garmin_delta_xc_charger_clip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ec6f66-6849-4934-af3d-e0d068843b8d/videbibif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ee2e70-4c39-4cf2-bb00-1af0d5e85b02/is_there_a_roku_remote_app_that_doesnt_require_internet.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_off0001cec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEC1 5524 bytes
SHA-256: f6e99eb976471218cb89ec15560a7739be9c43637ad22675a2d233971acb88d6
font_01_sfnt_off0001e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E18F 13412 bytes
SHA-256: f970ed3f294ea523c149755deef49892121e00735f177adfbf54c4be5bdbaa08
font_02_sfnt_off00020d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D8D 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74

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