Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb779ef486990d0…

MALICIOUS

PDF

74.6 KB Created: 2021-02-16 13:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 83ca031d255aaada4bb386c3ad6fae63 SHA-1: 603a9b9a99969e39987d6acfea7da0d1c52d52a5 SHA-256: 1fb779ef486990d074cfe3115478baa08d7456b27b4e7d9f3710e5cc3e5ddee9
126 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection scheme to deliver malicious content. The document body, though heavily obfuscated, appears to be a lure related to '32 westinghouse smart tv reviews', likely a pretext to drive traffic to these malicious URLs.

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://seumenha.ru/wb?keyword=32%20westinghouse%20smart%20tv%20reviews PDF link annotation
    • https://cdn.sqhk.co/pivugisaxap/ia6jhbH/79657020227.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/3725141214954k19.pdfIn PDF document text
    • http://fb-pageunderreview.com/17299371784ax18a.pdfIn PDF document text
    • http://inglassrus.ru/nubusaben94t8x.pdfIn PDF document text
    • https://cdn.sqhk.co/neviragar/4haIhcF/fijupipewajufuwexi.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/ijgj5Zn/83988764135.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/ibjiOKD/wifajelipopuvavovowosuso.pdfIn PDF document text
    • http://graatorama.fun/13718333987g0e23.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/ekbggjj/hangouts_extension_firefox.pdfIn PDF document text
    • http://avtoshtorki.shop/94110509524f8wy3.pdfIn PDF document text
    • http://fringigejy.site/63371144882z3asm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rubidokezive/aortic_aneurysm_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/rimworld_ice_sheet_raids.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 5304 bytes
SHA-256: 2f08dca10564dc3072577d6e1b339aaa9ff454709dc0b56716bf554caf80338f
font_01_sfnt_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 10264 bytes
SHA-256: 5398b4f28206990f0a77bc310efbc8efc673e637f52fe49d85409c79a1ad80af
font_02_sfnt_off00010f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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