Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42b56cd3a74ecf4…

MALICIOUS

PDF

67.3 KB Created: 2021-01-29 08:57:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9506d9480e2995fb5f750a5674898f00 SHA-1: b139ab8130d72157838a8923ff0487a9fc7ff863 SHA-256: c42b56cd3a74ecf4675bb007b72e290460fca871e3393eece47d8cb68432eba0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to "Directv remote replacement" and the authoring application, suggesting a lure to a potentially malicious website. The presence of many external URIs and link farm heuristics indicates a strong intent to redirect users to external, likely malicious, content.

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://maypoin.ru/123?utm_term=directv+remote+replacement PDF link annotation
    • http://comforfemj.fun/nemowilimaginesizabilozijgbscc.pdfIn PDF document text
    • https://zuzivosojix.weebly.com/uploads/1/3/0/7/130775151/bodipowo_pugotokitejim_xojijewaxekisud.pdfIn PDF document text
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/9845941.pdfIn PDF document text
    • http://thehensleys.org/rozumhmuen.pdfIn PDF document text
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/4888dfeb6.pdfIn PDF document text
    • https://wozaxopuvomu.weebly.com/uploads/1/3/0/7/130740129/4054963.pdfIn PDF document text
    • http://boevoenlp.com/wallpapers_for_samsung_galaxya4rxv.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/yngfieG/57469683649.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444371/normal_5fce6c279ac72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_600aa0e0b6d21.pdfIn PDF document text
    • http://1xbet-registr.site/thunderstruck_free_mp3_downloado3pgo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375694/normal_6005e3e68cf41.pdfIn PDF document text
    • http://activa-fb.com/pentimento_books_clinton_msm9rt2.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/0qjehg0/98560566119.pdfIn PDF document text
    • http://life-news.tech/aparichit_2_mp4_movie00imo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB98 4960 bytes
SHA-256: 317b838dc6bb5dda06a030ea7575e9360b7157aec3c6dadbff3cf5ec832be2ce
font_01_sfnt_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 10720 bytes
SHA-256: 3875ef4b598f85ad65a4562d2e7be799eb7c3ee31ca11b94ecf1c67a638737c7

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