Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cbbc85acb10bb5…

MALICIOUS

PDF

65.4 KB Created: 2021-03-03 17:08:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 07080168ee34a8dc9e7d7fea72cf8871 SHA-1: a8ecf3d8a318382bcd44f177ff838391821bd3a3 SHA-256: 36cbbc85acb10bb539f538b87810446a67319566fc9ed03cd71184544bba77b6
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to redirect 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
  • 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://jottigo.ru/wix?keyword=we+believe+in+god+the+father+we+believe+in+christ+the+son PDF link annotation
    • http://warixedivukinat.mygamesonline.org/graphic_design_pricing_list_malaysia.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/gfidoZT/92239880910.pdfIn PDF document text
    • https://cdn.sqhk.co/nixibaraje/hhhmge3/healow_patient_portal_registration.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/how_long_is_maternity_leave_in_illinois.pdfIn PDF document text
    • https://cdn.sqhk.co/lubigegek/dGhczhL/orange_tree_golf_club_scottsdale_reviews.pdfIn PDF document text
    • http://rajizaloka.iblogger.org/29678442338.pdfIn PDF document text
    • http://rexirututesopew.iblogger.org/barefovakoguzotoda.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/99jb7jc/ruporunebavuvos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sijadogif.atwebpages.com/maserati_quattroporte_2008_for_sale.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/xojevevadumizagi.pdfIn PDF document text
    • http://tawegimasozaj.epizy.com/annayya_songs_chiranjeevi.pdfIn PDF document text
    • http://xapipulasojogod.epizy.com/barrovian_metamorphism.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_off0000c346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC346 5588 bytes
SHA-256: 953610fed08a25cd509c357c90cdd59adffa8937633ec43439f30402324fe688
font_01_sfnt_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 9812 bytes
SHA-256: 55a530c23172b3345781017200e3ce465d837fa4a3656a7b909bf1f8a774ea87

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