Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c33e99620b7830…

MALICIOUS

PDF

88.7 KB Created: 2020-12-28 10:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 41d70b12f83f86bda3c5a79708ef45ab SHA-1: da999188a60e16af3e37bce5057f8a35145ddb8e SHA-256: 64c33e99620b783051e7be0ae6e435cc60309772b30675b57be7951be238548d
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. One critical heuristic identified links to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam, disguised as a game download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=bicycle+racing+games+download In PDF document text
    • https://cdn.sqhk.co/kosuxatune/idNifgy/volume_booster_sound_booster_music_eq.pdfIn PDF document text
    • https://cdn.sqhk.co/lusajiki/ifghihj/rozanodujekinarilaguze.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/funefore_tuvujukoxetafib_maxaveninugaboj.pdfIn PDF document text
    • https://bagolisenavela.weebly.com/uploads/1/3/4/4/134496394/vinufovaguxozik-pugidi-somaz-lipetemog.pdfIn PDF document text
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/db6d45e78.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/3313791.pdfIn PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/8583153.pdfIn PDF document text
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/vetazasati-komet-porogisiba-fareme.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/57538414-c36a-4b94-9835-806973ef179a/mini_warriors_three_kingdoms_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd73956-b9f7-4b09-9dc9-d2223495f8e7/19375581614.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/bass_guitar_lessons_for_beginners_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b8ce7f-9a16-4eaa-8834-95247e336313/gazaluwuji.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/butave.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_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 5504 bytes
SHA-256: 9411988c1beee984f68ad8eddae4e753f88906cd7d17d399bd628cdfaaad010b
font_01_sfnt_off00012f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9B 11120 bytes
SHA-256: dad4821c7e5f92534ec4998a173243cec29fe4c32a12a2a9eada8d79275f3d5f

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