Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f76a170c7faf8f…

MALICIOUS

PDF

80.5 KB Created: 2021-03-10 07:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 99a2eba5997067b40c23a68df1a52b74 SHA-1: a2c13c527a75a4c36322df67a43ef4ba66fd102e SHA-256: 28f76a170c7faf8f1e25bdf4443ee1d93232e895f2727ec40d4740954fcb0ebc
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, golowaki.ru, which is likely part of a phishing or malware distribution scheme. The PDF structure and embedded content suggest an attempt to disguise malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://golowaki.ru/award?keyword=bls+2020+algorithm+pdf PDF link annotation
    • http://xavelodezazil.iblogger.org/2018_chrysler_pacifica_navigation_system_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426699/normal_6011da850c7fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_601fb72c4d98a.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/xudorixitijuwodul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385231/normal_5ff755d4d55af.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/what_does_yellow_light_mean_on_belkin_wifi_extender.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/07423cba-f8be-49aa-ac1f-af0fdd51592b/sumuzusikojokejorurox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32a3a28-221e-485a-8551-b62ae4a17a8e/pavel_tsatsouline_workout_routine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d25ac3b-a14b-4561-8448-f44b4b0df059/when_does_the_fourth_wings_of_fire_graphic_novel_come_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f646a51-be5b-417b-a008-29a26581edb1/jezozunugufamozekoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49cf279d-1504-449d-88d1-bd14a98d588f/tosulukedumavijogitamix.pdfIn PDF document text
    • http://mibexumobanoko.rf.gd/paint_brush_texture_fonts_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba374615-3dc5-47d4-b712-a09f91b9f89f/how_long_to_charge_mophie_juice_pack_air.pdfIn PDF document text
    • http://kejidexod.epizy.com/porinuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd838a7-94a9-4f31-b8b9-baffded317c5/lincoln_210_mp_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba063fa7-acb5-4c7e-b242-42ca856f25f7/2551427942.pdfIn PDF document text
    • http://jexonuwunow.epizy.com/new_android_apps_oct_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14eaa83-d6cb-441a-9e69-ca7aaf0c501d/percy_jackson_and_the_battle_of_the_labyrinth_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b792e74-dfc1-4cfb-90f0-67e37b1fd93f/kareravegubitiwawup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd73e9c-3ce0-47e5-a6b0-d6abbad6548f/asus_xonar_dx_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb7cec9-2776-4450-aed5-617eba347d62/5549573556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e02ce146-1cf0-4636-83e6-1ae49563b3a8/52173970632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35b5f92-e264-4a1d-964d-2d706ef4c035/how_much_does_it_cost_to_get_a_forklift_licence.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://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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 5344 bytes
SHA-256: 54edad8a1646414250965825a9b06bb9d8adc8dd2ec21ebfd4383d1199d91ec7
font_01_sfnt_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 10368 bytes
SHA-256: 87de259fb41edb262f38bc8012ea13e73d0dc0256acaec77c9109bc9b6bb7a59
font_02_sfnt_off000126a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333