Malicious PDF — malware analysis report

Static analysis result for SHA-256 804cc0210453f0ab…

MALICIOUS

PDF

83.0 KB Created: 2021-03-16 04:22:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bef187a155b5b7458d8449b0a577d589 SHA-1: 97a8af1dc38997b7bf3bd480cea329d0da392b6d SHA-256: 804cc0210453f0ab696060dcd563e97950c6fd30786dd2643e95e9fb4324fb9b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=watch+star+wars+2015+online+free+reddit PDF link annotation
    • https://cdn.sqhk.co/fapolokid/Hjbdihk/40757698629.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/YtjbjbM/billie_eilish_brother_girlfriend_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/vigibizez/iblidSy/chocolate_cake_recipe_easy_homemade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_604e34d700347.pdfIn PDF document text
    • https://cdn.sqhk.co/mugetawelumi/jfRjChg/donodexizukot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_60484bab6a629.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/iehfyhc/60578461472.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/Fcrgeie/democracy_definition_greek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fe13dfd89f82.pdfIn PDF document text
    • https://cdn.sqhk.co/kamepixuxuk/QjiVRhe/jizenavafanixetuzanejog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_0515541bf0994cd5a5de1932a1d03b35.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_7852dde06dae4080a10a02b69de6fb6d.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_b581d30c032249ce8d990c0f8e2aaac7.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_35f090e2cb84489c8698a1cb708d9a4e.pdf?index=trueIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_86e117aec5c147c5accbe67b51cab49b.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_640b9e9e882c4fee946553f030e5a1c8.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_2a5d386c6f33461a8297b5dcd42be776.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fcb6502-0df3-406b-8cdc-09e9db7c3121/65139170435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927cf067-0c77-4654-9c9a-28c9346a5bf0/the_giver_chapter_5-6_vocabulary.pdfIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_a28104391ca44816a98e9d6c90f174d1.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 5664 bytes
SHA-256: 94489c2d4203e13e5b930d496d3bd3237e81d5d64899b2bd0abd8ebcf32c5bc3
font_01_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 11192 bytes
SHA-256: 0af0553ef385228ed54421a4983c075d2c4575c65bdf339800b70e500f08681d
font_02_sfnt_off0001276f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276F 16520 bytes
SHA-256: ba8a0fcf7e87aa2fc563a3bd19d7fabffbcf9c3bc8e6d1f9e4a567003630d9bc