Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f672f0cec2d70c…

MALICIOUS

PDF

79.6 KB Created: 2021-03-05 04:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f885f6714b307523c1472bd92262c3f2 SHA-1: 4d69de088e7904f4c51a8c09f026e08dfa163cbd SHA-256: 97f672f0cec2d70c69223df240876bcc1a429d62fb69fa1bc3d4e5568dd2e20d
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on low-reputation hosting, a common tactic for evading detection and maximizing reach. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=understanding+motivation+and+emotion+6th+ed PDF link annotation
    • https://cdn.sqhk.co/fifapupifig/UICoeyJ/dark_forest_background_wallpaper.pdfIn PDF document text
    • http://yozi.store/150470673871orj8.pdfIn PDF document text
    • https://dawijenumekoxel.weebly.com/uploads/1/3/6/0/136087820/rewatazevokelon_fulif_zafezivekom_muretefibumip.pdfIn PDF document text
    • https://dafizoxov.weebly.com/uploads/1/3/5/3/135309439/3aa20d6c6165.pdfIn PDF document text
    • http://iwhite.space/86394928826ehr2t.pdfIn PDF document text
    • http://newser.site/gaxefusedoredutazitatoc6221.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/d2dicgi/80740463461.pdfIn PDF document text
    • http://autolombardpro.ru/dagivudisenefapojobumus6rmoa.pdfIn PDF document text
    • http://koteyarn.moscow/sikatatuzovuba0c8t5.pdfIn PDF document text
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/4642840.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/dPhguDQ/27421029091.pdfIn PDF document text
    • http://myfavoritesun.xyz/redstone_builder_for_minecraft_pe_free_downloadmrbvp.pdfIn PDF document text
    • http://shlifovka-pol.website/41762338302oii0g.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/dR3hddQ/roreboxabupimijevu.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/ii4gcUJ/756750617.pdfIn PDF document text
    • http://sexesex.site/zelanuxadavegumedozu3okq.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/fajeloninesitel/28878932504.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/boy_scout_uniform_shop.pdfIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_197848997bd44acf950163b5e07ca2bf.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_41c248d7616042c482ba0626b2ebe9f8.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_47bbd0de0acf4f63a3df8f23b74dc5e6.pdf?index=trueIn 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_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 5412 bytes
SHA-256: 5a483999001a608689c68459171622aecae50a2ba79a00739dfae2af528236f7
font_01_sfnt_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 11232 bytes
SHA-256: 485398bb3960e2e645ee539495d28a047d361e2da6cbb744accbfffc9a290db6

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