Malicious PDF — malware analysis report

Static analysis result for SHA-256 43217c7f227ad451…

MALICIOUS

PDF

71.3 KB Created: 2021-01-17 10:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ca89115dcdbd5f78ad9fe128894bf5f SHA-1: 84cfce79bdcf34b7cc4713ac972530bdbcf45a72 SHA-256: 43217c7f227ad4516e294a9ce9af63844674211fab4a70753e502b42f8391bf2
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'ryobi cordless router edge guide' and appears to be part of a link farm, with numerous embedded URLs pointing to various domains. The primary malicious activity observed is the redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=ryobi+cordless+router+edge+guide
    • https://cdn.sqhk.co/xubulozirod/mfvKgj6/tiny_bubbles_laundromat_baldwin_ga.pdf
    • https://cdn-cms.f-static.net/uploads/4472208/normal_5fd379f2469ce.pdf
    • https://static.s123-cdn-static.com/uploads/4479673/normal_5ff8de2da55b2.pdf
    • https://site-1168144.mozfiles.com/files/1168144/vivemakujewolomodevakon.pdf
    • https://cdn.sqhk.co/lapefuxolu/AggjjeW/tagutosixusiba.pdf
    • https://cdn.sqhk.co/wazafanez/hiMNhi7/89206404868.pdf
    • https://cdn-cms.f-static.net/uploads/4455194/normal_5fbbd4b6cf61e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://luxixeg.epizy.com/9636378792.pdf
    • https://s3.amazonaws.com/jowutoneranemuk/18421197121.pdf
    • https://s3.amazonaws.com/rakabexozu/gcse_chemistry_for_ccea_second_edition_answers.pdf
    • http://bubewap.rf.gd/64478428301.pdf
    • http://tutivute.epizy.com/administrative_court_guide_2017.pdf
    • http://fepoxojosatomu.epizy.com/2009_ashrae_handbook_fundamentals.pdf
    • http://tosopipates.epizy.com/ind_vs_wi_today_match_pitch_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db0a.bin
02fea40b5a3f764f87fea616d80def04a64ed64b28878f8e0465020bc0a5719b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 5148 bytes
font_01_sfnt_off0000eca7.bin
8842f1a84c84576c798a77b3241f6fd17196119d66c56794c43f3c81817a8b11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 10516 bytes

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