Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bc0a17446f2bb7…

MALICIOUS

PDF

72.0 KB Created: 2021-03-31 07:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d9c2215930d3482e3b6edfa37ebb5c6 SHA-1: 17ea8b6c5a3fb322da4e9bc288468980ca299fac SHA-256: 93bc0a17446f2bb702761734f06f4829349ad775d2e15a064970db7bdb1d781c
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier strongly indicates maliciousness, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure malicious destinations. The document body, though heavily obfuscated, appears to be a lure related to a cookbook, likely intended to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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/aws?utm_term=dutch+oven+cookbook+vegetarian
    • http://vufajed.getenjoyment.net/39146050879.pdf
    • http://texewofe.22web.org/android_phone_compared_to_iphone_x.pdf
    • http://relodifalixogo.scienceontheweb.net/garmin_vivofit_3_activity_tracker_white.pdf
    • http://wirobigi.medianewsonline.com/texas_instruments_ti-84_plus_ce_apps.pdf
    • http://giwosoto.sportsontheweb.net/diode_and_zener_diode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kugixuxekut.rf.gd/fedobogagogebugo.pdf
    • http://sinusisokopex.atwebpages.com/the_bipolar_ii_disorder_workbook.pdf
    • http://jutesokom.rf.gd/doxirabekazu.pdf
    • http://vekamujibatebig.rf.gd/jurusekazar.pdf
    • https://uploads.strikinglycdn.com/files/7e2107e7-214e-4558-a106-ef0de896b678/polk_magnifi_mini_subwoofer_wont_sync.pdf
    • http://wodedane.rf.gd/36397911415.pdf
    • http://tozemuj.rf.gd/necky_looksha_17_price.pdf
    • https://uploads.strikinglycdn.com/files/4b850462-7924-4513-ab52-ff5b8b93847f/craftsman_6hp_30_gallon_air_compressor_manual.pdf
    • http://zezexobufimorum.epizy.com/michelin_green_guide_egypt.pdf
    • https://uploads.strikinglycdn.com/files/8f0c9deb-d582-427d-86e6-1dbb62909851/51719824312.pdf
    • http://vawapod.rf.gd/xetogajulepefuzabupexiwu.pdf
    • http://numowun.rf.gd/deutschlandkarte_bundeslnder.pdf
    • https://uploads.strikinglycdn.com/files/8033e948-a791-4d20-86b0-367b72ff9b3f/30925693675.pdf
    • http://paguxesij.myartsonline.com/1275498164.pdf
    • http://denuvifateve.epizy.com/stacy_s_mom_parents_guide.pdf
    • http://mezajuwobit.rf.gd/58420359963.pdf
    • http://zogoxuf.atwebpages.com/65928698717.pdf
    • https://uploads.strikinglycdn.com/files/80ac3f19-5978-4eeb-8890-95621da94b4f/99238864574.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd0f.bin
db19d79c12269529fcbed3b6f70e853a609f9c97b94974678e01bb81d9332578		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 5116 bytes
font_01_sfnt_off0000ee81.bin
4fa2cd22476f056c3b9a2f0d629a98c13b8caa51eccfc518793655849f25452d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 10744 bytes

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