Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d875cfdba64e041…

MALICIOUS

PDF

79.0 KB Created: 2021-04-29 14:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6e9cd302a185661b581abbbcdc330215 SHA-1: 8bea7aa2a0d2f3beffc059a81d591ff1ffaf356b SHA-256: 3d875cfdba64e041c61da2d8fd4a6ab3dc15812515643af0a62ed43437800046
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a site that exploits them or serves malware. The document body, though garbled, contains keywords related to medical test strips, aligning with the URL's search query pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+long+are+accu+chek+test+strips+good+for PDF link annotation
    • http://i-men.ru/sobiwudapimu9kj.pdfIn PDF document text
    • http://xviiivbgz.com/sidepafexaresipoturowatiwractb.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/mjfcUgj/gufakutajogonunad.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/Ygjf8ig/ice_blasters_clay_pigeons.pdfIn PDF document text
    • http://termometr-medikal.site/76126420486qq742.pdfIn PDF document text
    • https://cdn.sqhk.co/sipupubu/jgKdgcu/the_farmer_in_the_dell_instrumental_mp3_download.pdfIn PDF document text
    • http://testersairf.xyz/bixik9bpl6.pdfIn PDF document text
    • http://soinjaga.ru/fufipamatofeludifuke25kz3.pdfIn PDF document text
    • http://nudistoff.club/29150579313ifv91.pdfIn PDF document text
    • http://keepxufi.space/44021452257f19sr.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/23014705902171k5.pdfIn PDF document text
    • http://microdigitalmeter.xyz/how_do_you_fix_a_whirlpool_duet_washer_that_wont_drain4gls5.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/jdAMicC/ps2_alien_strategy_games.pdfIn PDF document text
    • http://hocostyle.ru/google_chrome_internet_manager_extension31u12.pdfIn PDF document text
    • http://lalat.space/what_is_a_different_word_for_sword_fightingydm08.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/6WicYzG/rabibatadorubabigisawuze.pdfIn PDF document text
    • http://usene.xyz/xupedubaxupazn3.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/ifgijgh/rezatuzimej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buzanuziti.myartsonline.com/whos_still_alive_from_white_christmas.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/30915162480.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 5536 bytes
SHA-256: 3b2056f0f26a01e066b7cf818e04da0cdaf6b568fae92dde4cc1f658f5c748d5
font_01_sfnt_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 10588 bytes
SHA-256: 788c5648a9cc96cbc3ae6d3cd7bc3feaab65dfaf2e1e13ae937c8a12f03b46db
font_02_sfnt_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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