Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f26085b28d61b0…

MALICIOUS

PDF

84.5 KB Created: 2021-03-14 13:09:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3d38d9c33254143d16c71347510fcc55 SHA-1: 2685c8f19ba7bc80283912cd3db0cc3d1bf71f40 SHA-256: 35f26085b28d61b02046e1ca11c74bfe175cfcccbd431e3fb99afa3badcb4f31
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 0.9981

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://gimoguvi.ru/award?keyword=consumer+buying+behaviour+process+pdf PDF link annotation
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/nupig_mosamobova_lededikolep_wetetofevotoso.pdfIn PDF document text
    • http://zanodopowe.sportsontheweb.net/mpc_essentials_no_sound.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/jafimawivow.pdfIn PDF document text
    • https://kizinuraximi.weebly.com/uploads/1/3/4/4/134446503/8865525.pdfIn PDF document text
    • http://sijiwepi.mypressonline.com/18155888056.pdfIn PDF document text
    • https://zerakekume.weebly.com/uploads/1/3/0/7/130739742/nuponuki.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/2802452.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/62bf9fba-de07-444d-9fe2-b10f087b2e47/49954561345.pdfIn PDF document text
    • http://pefimubis.myartsonline.com/jawojizevavufuxevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76948fe2-d107-453e-b012-372927924ebe/kebejupujizumop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cbac30c-81d4-4af5-8f15-2f97b9b29719/nigifarasogaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/745ffa49-18bf-4ee9-8c8e-4b9eb78b9ed5/which_css_framework_is_best_for_react.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/zelda_elixir_recipe_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84883bba-4c20-4d12-bf28-9ec7ff163967/janexago.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_fc4f3110fc7a4b2ba6eed1ac15c127d1.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_442702494aed4aadb80fbccae22b1554.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f5f75e-d06f-4b52-baf9-c0866cd50bb7/why_was_sonny_killed_in_the_godfather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/499d2b6d-c71f-402d-81a2-9453591045fb/what_is_one_touch_ultra_control_solution_used_for.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/telugu_love_feeling_songs_ringtones.pdfIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_0076ff2a74474c6b95742bdb858f5a44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82607d62-5094-4e95-a2e3-3f5013eb8cfb/machine_learning_with_python_book_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65cc8fc-daac-4699-9fb5-8356ee3c3aef/naruto_shippuden_databook.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/nebimuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/curriculum_map_format_deped.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 5744 bytes
SHA-256: 50cb09320b0d57465439d38dcb309a7ceba175ef6f314a2fc5c9747ee87c949b
font_01_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 11008 bytes
SHA-256: ee3166df099885ba7c24a7916cb1f0a41f71fae4c488277eb809e8369b244e74