Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea623c7cf4af341…

MALICIOUS

PDF

91.5 KB Created: 2021-03-08 22:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 14a7198249bcd1046b4a346847a0297b SHA-1: d59e57a09495f8df21d8b9e89a9862f13c10d289 SHA-256: cea623c7cf4af34194b53f2de270c8eae3e869fa13e6526261ef3e138a36cca3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing lures. The document body, though truncated, suggests a lure related to 'crochet pattern for unicorn hat and scarf' which is likely a deceptive pretext to encourage clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=crochet+pattern+for+unicorn+hat+and+scarf PDF link annotation
    • https://cdn.sqhk.co/kovezozeseg/9mVtieb/new_hero_bike_xtreme_200r.pdfIn PDF document text
    • https://cdn.sqhk.co/datagemop/VZrdFZo/mikagunebatoguvovaxite.pdfIn PDF document text
    • http://verifybadgesbusiness.com/94166237225b938.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/jdjfXGq/house_music_radio_fm.pdfIn PDF document text
    • http://vittorguxx.site/plant_physiology_and_development_downloadrnfnp.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/tSG8jdF/xirezufebamisemexikide.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxoporerom/cZgjMie/maxpreps_philadelphia_ms_football.pdfIn PDF document text
    • https://cdn.sqhk.co/mojubemuwek/hb3psij/xegazejakobesowitas.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/fwLhefI/real_steel_cast.pdfIn PDF document text
    • http://arevakar-travel.com/84747453794ypflg.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/Oic3Zjc/84707338266.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/vebisop/zijadineso.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_3d82ac2363244f1b832410e4f657866b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisoxow/xodepebowudusi.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/84015654308.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_2d8db57044624688814df319d197251e.pdf?index=trueIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_9cb5167b8cf4483e847a280841b55b07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/5831287457.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/marketing_strategy_of_coca_cola_company.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/nugojetewuzemosoze.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/3802296402.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_639380f8938f4842a095db4663487ea4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farezelof/babul_meriya_gudiyan_song_free.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_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 5116 bytes
SHA-256: 47004ee44f3b93b04bf486a855525dbc4f260422398ff843436f64e12ba9818d
font_01_sfnt_off00013b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B27 10940 bytes
SHA-256: 32d1d1db7590abeaedfcb13dff1e87e5228de10c79ee2ae14d6b1077a70229a8