Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b3cf399f59cd21…

MALICIOUS

PDF

71.9 KB Created: 2021-06-14 09:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b50818a8521130184b02f11b2c1cf1d SHA-1: 05cac2b046c5e5acff0c7b471730ad32abba4d7b SHA-256: f7b3cf399f59cd21b4bf8abc2de05826dc4a189e6e6bff8a3b497ee969c2a994
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs and the heuristic firings point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/pbw?utm_term=dead+like+me+full+episodes
    • https://wujuxibivotalo.weebly.com/uploads/1/3/1/4/131453464/fobufumoluxidaxigeb.pdf
    • https://vowotefanofug.weebly.com/uploads/1/3/4/0/134012563/puxegadufedob.pdf
    • https://mobejameraxoluv.weebly.com/uploads/1/3/5/3/135316129/ad079f.pdf
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/romumuvamaw_gijavep_rafonajon.pdf
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/8990664.pdf
    • https://cdn-cms.f-static.net/uploads/4486374/normal_5fdb5d20db64e.pdf
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5ff2e55a4c16a.pdf
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/mivodoxuvebogej.pdf
    • https://jeboxuxu.weebly.com/uploads/1/3/2/7/132710743/vikifozikiv.pdf
    • https://static.s123-cdn-static.com/uploads/4377697/normal_5ff11676cb1f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7c7f345e-50a6-4244-8241-657726ff6f58/fighter_diet_sample_meal_plan.pdf
    • http://zolunegoli.pbworks.com/w/file/fetch/145138650/open_source_intelligence_techniques_michael_bazzell.pdf
    • http://patimedudemu.pbworks.com/f/leccion_de_escuela_sabatica_cuarto_trimestre_2019_power_point.pdf
    • http://xefobukeza.pbworks.com/f/mortal_kombat_xl_sub_zero_moves.pdf
    • https://uploads.strikinglycdn.com/files/4b92054e-b536-419c-ac14-d6fc79534d18/we_will_make_up_for_the_lost_time.pdf
    • https://uploads.strikinglycdn.com/files/3473b129-de23-4ec3-ba8a-cd459602c6a6/29315416563.pdf
    • http://pebolokunaz.pbworks.com/w/file/fetch/144616137/forming_and_naming_ionic_compounds_practice_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/461f4ad4-8ec8-45ef-98ee-4b9fcbd0b430/1048867923.pdf
    • http://zuvuzut.pbworks.com/w/file/fetch/144671145/room_escape_contest_2_solution_level_31.pdf
    • http://nudenuxote.pbworks.com/f/genki_2_workbook_2nd_edition.pdf
    • https://uploads.strikinglycdn.com/files/25888c69-bbcb-442d-8a71-4c91bf15efd4/dell_xps_8300_ram_upgrade.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_off0000db6c.bin
f9de633c1b7aa448efe2f54f020df80086b0fb1f7b4432a603fcb18f8d850bdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 5156 bytes
font_01_sfnt_off0000ecee.bin
f99175f197c4eb15408adf29b6e33121deb7590f3626b68a616e7de2efdc09ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 11308 bytes

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