Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e969c3d3e65eea1…

MALICIOUS

PDF

95.7 KB Created: 2021-04-01 19:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4ea1f64dad8e5fb192f98deec91454d SHA-1: 2f78d97506866d13add96894fa3a62f7ce7f826d SHA-256: 2e969c3d3e65eea1caf00033c6d2a0a7fb25cc484eea3e175d3a6101c89b73d1
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the document's structure suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://midufefew.ru/wix?keyword=human+memory+gabriel+radvansky+pdf
    • https://static.s123-cdn-static.com/uploads/4424036/normal_5fefab5847123.pdf
    • http://kisuvok.scienceontheweb.net/biochemistry_and_biophysics_book.pdf
    • https://static.s123-cdn-static.com/uploads/4368751/normal_5fdca7cdc12b7.pdf
    • http://kemedejovon.getenjoyment.net/weathermaker_8000_trouble_codes.pdf
    • http://lamaded.mywebcommunity.org/gisenuduxoz.pdf
    • http://larebalin.mypressonline.com/16639774051.pdf
    • http://mapotilij.mygamesonline.org/jack_reacher_novels_in_story_order.pdf
    • http://xepidenad.scienceontheweb.net/canon_mp240_printer_driver_windows_xp.pdf
    • http://tarekupi.scienceontheweb.net/51608648553.pdf
    • http://xutifufaxe.mypressonline.com/madodiler.pdf
    • http://konalofasu.mywebcommunity.org/wahl_trimmer_amazon.ca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_baf7b987b7314fb4be4991276d35a2e6.pdf?index=true
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_4b3e857d191f49eb9264300d623bbfe7.pdf?index=true
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_f6ae96b2c7664b28b0fefa6c751b3e64.pdf?index=true
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_36521b2157c34600b46223b822896370.pdf?index=true
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_3955bf88a04a44e09a8197c86854abef.pdf?index=true
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_ff8c16f8160d4b929923941bec69f1f2.pdf?index=true
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_15f129c80d37435aa4a1313e6a6ef1da.pdf?index=true
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_e85766bf46dc4b21a4d035b50f151317.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123e5.bin
443b0f7e3af2add47b0631f659937938fc1bbb02fb10cf06d1196e57ccb90b9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 5688 bytes
font_01_sfnt_off0001372f.bin
771e6b01a8e81dc99d73b79ac4a535383d30311e32dde9d3bf357cdc5a4d6a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1372F 11232 bytes
font_02_sfnt_off00015cd6.bin
d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD6 16060 bytes

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