Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb74e5475bc631be…

MALICIOUS

PDF

78.9 KB Created: 2021-03-02 02:26:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 04d2303de09dd55e2ff947e00a277078 SHA-1: a4fc4291bba587b59d9eb90f313bad68183c9d1d SHA-256: fb74e5475bc631bea668bed7b8ad8b7d2324465c1ea529997096efea7b42fa7c
184 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a PDF redirector and phishing attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content. The numerous embedded URLs point to disposable hosting and known malicious redirector infrastructure, indicating a likely intent to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/wix?keyword=the+westing+game+chapter+7+questions+and+answers In PDF document text
    • https://cdn.sqhk.co/jijubexovoz/burpmT0/peron.pdfIn PDF document text
    • https://cdn.sqhk.co/bifugudawesu/gihjeiq/soccer_penalty_games_free.pdfIn PDF document text
    • http://gakivako.iblogger.org/69188401836.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/hdpBjdL/21158848725.pdfIn PDF document text
    • https://cdn.sqhk.co/murofoli/4TRlk6M/pokemon_sword_and_shield_dlc_legendaries_locations.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/bowflex_pr1000_home_gym_accessories.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/which_states_are_prevailing_wage.pdfIn PDF document text
    • http://wonamesavap.iblogger.org/31726094511.pdfIn PDF document text
    • https://cdn.sqhk.co/terupilenu/IBCjiUN/sewapewok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vurefubopixutap.epizy.com/xeporiduwuliwuwafejixuvan.pdfIn PDF document text
    • http://ferovugosewago.epizy.com/2280374514.pdfIn PDF document text
    • http://jajapelemazibog.rf.gd/commercial_lease_agreement_template_south_africa.pdfIn PDF document text
    • http://sezulezaba.rf.gd/outlander_diana_gabaldon_series.pdfIn PDF document text
    • http://mafevela.rf.gd/12235080788.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_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 5704 bytes
SHA-256: e75f416516afdadf8e5c13223412cb11205e584c673fedee0390cd7ed9b0a460
font_01_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 10596 bytes
SHA-256: 1f1ab2084734c2756445affd0c4892cdf5596175572b58837d4927c38fac089e

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