Malicious PDF — malware analysis report

Static analysis result for SHA-256 5647ae1b72f9caa1…

MALICIOUS

PDF

66.0 KB Created: 2021-02-20 22:24:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 82bd4ed2a2d246e398e2d97c243a3672 SHA-1: caeed229c24680a296586e2a85c8395890ea2800 SHA-256: 5647ae1b72f9caa1e3200c52f355040b783e6ee1a73627c258b3b8000f235994
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. Although no scripts were extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely initiated via a spearphishing attachment.

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
  • 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://druttle.ru/strik?utm_term=midland+gxt1050+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366327/normal_5ff788649b1c7.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/jbjeqhe/vudatiposuvemusozikopudu.pdfIn PDF document text
    • http://sokolov.fun/diy_horse_run_in_shed_plans4agbo.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/5ZoBdhe/best_rome_total_war_mods_2020.pdfIn PDF document text
    • http://italy-small.space/ferrari_logo_carbon_fiberc90yz.pdfIn PDF document text
    • https://cdn.sqhk.co/wifepodilojo/dgjTEje/guitar_cabinet_impulse_response_files.pdfIn PDF document text
    • https://cdn.sqhk.co/xenojepezere/fxljdxV/menusepibo.pdfIn PDF document text
    • http://idealica-italiaoficial.site/download_video_blob1dofx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457620/normal_5fe112ba371e4.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/KrjigjR/runes.pdfIn PDF document text
    • http://tdsevsvet.ru/fetal_circulation_notessmbv6.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/dgejgih/7127032640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sewamos/51703243405.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/xumonafiju.pdfIn PDF document text
    • http://kogisovaf.epizy.com/wordpress_email_template_editor.pdfIn PDF document text
    • http://vogojitipam.epizy.com/lagu_kartonyono_medot_janji_palapa.pdfIn PDF document text
    • http://zajunevoza.epizy.com/detox_diet_side_effects_skin.pdfIn PDF document text
    • http://fokoxowikelejex.rf.gd/joshua_tree_national_park_guide.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_off0000c546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC546 5260 bytes
SHA-256: 411f0131d2576680ad09db14c71dd3abba2550f1d59ce95bfb7ae2ed2f617eb7
font_01_sfnt_off0000d736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD736 10736 bytes
SHA-256: 884dd2f3a5f6de117513cd8aa85193d6f40b946c8641af1da6b5a149b5e46ed1

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