Malicious PDF — malware analysis report

Static analysis result for SHA-256 6460570ceb60cdcf…

MALICIOUS

PDF

79.5 KB Created: 2021-03-29 13:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 74d0fa4f3b9744a8899d53793b60e426 SHA-1: 21892eac05b57c6c9109956bfc5aa9cc3bb46736 SHA-256: 6460570ceb60cdcf4dfa41626c83447c0a4f194ea7d45b906de5a7649632911c
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. The presence of 'cMdydm' in the document text suggests an attempt to disguise commands or URLs. ClamAV detection and ML classification confirm the malicious nature, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://botokaw.ru/wix?keyword=alpha+sapphire+guide PDF link annotation
    • https://cdn.sqhk.co/ronofumito/NjbAD9q/fejusavalasasugawitoxida.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/hhkHgff/39041611644.pdfIn PDF document text
    • http://rezokivi.medianewsonline.com/tefumukiwelatudu.pdfIn PDF document text
    • https://kipunelikerave.weebly.com/uploads/1/3/0/9/130969086/rawinizeluk-gopadusekaz-vufafawuxok.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/hiSViii/80824056518.pdfIn PDF document text
    • https://cdn.sqhk.co/rurizibaxami/gegihdD/roku_tv_no_sound_tcl.pdfIn PDF document text
    • https://cdn.sqhk.co/nusatabi/jYO9eic/guilty_crown_how_many_episodes.pdfIn PDF document text
    • https://cdn.sqhk.co/kawaniroti/idxbvgg/spiral_lighted_christmas_tree_green_lights.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/jepotoketevigerox.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/hiekoK8/brick_ball_crusher_level_270.pdfIn PDF document text
    • https://pisusafinado.weebly.com/uploads/1/3/4/3/134363103/jikep-tekebip-sisuwefakogumem-gevanivavini.pdfIn PDF document text
    • https://dalagusixofu.weebly.com/uploads/1/3/4/8/134853238/e5d028d74d.pdfIn PDF document text
    • https://jadimakadafi.weebly.com/uploads/1/3/4/3/134378671/doxug_lorilerefimav_modunabezamen_xejad.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/icMdydm/megabus_orlando_to_tallahassee.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/w0icM0G/16964010373.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/9a8e750f-a3c2-49e9-8387-10785afc8c84/4075205896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ef9443-1803-4c9d-9576-2ae904c63062/how_to_replace_an_air_conditioner_compressor_house.pdfIn PDF document text
    • http://furafep.onlinewebshop.net/babubeditigo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 5212 bytes
SHA-256: fc8b4d6b71cb284e199a9381a8c846c7ca1bec69f83e3eb103a91015bb3c6f75
font_01_sfnt_off00010d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 10476 bytes
SHA-256: e13afab70c9f0f43e11696b7d32d052c551703b8d3609533473413136a3dbaf9