Malicious PDF — malware analysis report

Static analysis result for SHA-256 1552290c3c1eee5a…

MALICIOUS

PDF

79.3 KB Created: 2021-06-10 13:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 368c492e76c8ac14bd39f8f91df066d1 SHA-1: ada25ab7618a2a98b467400bc5df756e627e8a12 SHA-256: 1552290c3c1eee5a3d08b8734be19ac7e4c0cc28acb113cda3baafbcfc60dce3
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, suggesting a link farm designed to direct users to potentially malicious content. The primary URL, 'https://crewmak.ru/pbw?utm_term=ome+tv+download+for+pc', appears to be a lure for software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to 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://crewmak.ru/pbw?utm_term=ome+tv+download+for+pc
    • https://bifagawu.weebly.com/uploads/1/3/7/5/137512270/6249874.pdf
    • https://kizegugiruliti.weebly.com/uploads/1/3/4/7/134729255/228d66cc11f0241.pdf
    • https://static.s123-cdn-static.com/uploads/4452624/normal_600652b000e5d.pdf
    • https://cdn-cms.f-static.net/uploads/4469116/normal_600f0f561f1d1.pdf
    • https://static.s123-cdn-static.com/uploads/4410030/normal_5fcb102fbb423.pdf
    • https://xonedanafesiliw.weebly.com/uploads/1/3/4/6/134633415/fetasulerijub.pdf
    • https://dujezipiver.weebly.com/uploads/1/3/4/6/134610991/kukemegeg_kusob.pdf
    • https://lekakuvikel.weebly.com/uploads/1/3/1/3/131380005/lagonovomof.pdf
    • https://filajusarapobu.weebly.com/uploads/1/3/4/7/134761194/purugatax-fafexavolagebo-ruruv-tozano.pdf
    • https://fupigipefixoxom.weebly.com/uploads/1/3/1/3/131379213/2238680.pdf
    • https://fisudobu.weebly.com/uploads/1/3/0/8/130813554/5bb43c3bf4201e9.pdf
    • https://static.s123-cdn-static-d.com/uploads/4476577/normal_60b4f46d4d4c8.pdf
    • https://kejuzeke.weebly.com/uploads/1/3/4/4/134456394/2379720.pdf
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/84deeac.pdf
    • https://cdn-cms.f-static.net/uploads/4502246/normal_5fd3d28173e16.pdf
    • https://numuwawi.weebly.com/uploads/1/3/2/3/132303164/9a78d18392853c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3456e198-17bd-4d32-8b4f-247b2cecf499/95_polaris_sportsman_400_4x4_review.pdf
    • http://bojifimaral.pbworks.com/f/download_and_install_steven_universe_unleash_the_light_apk_mod.pdf
    • http://mupalunava.pbworks.com/f/58157541581.pdf
    • https://uploads.strikinglycdn.com/files/aa7e1fb8-bc1b-4616-8cc9-b860758a253c/jagubujenuvodosizosugevo.pdf
    • http://dujimowiwup.pbworks.com/f/pre_suasion_robert_cialdini_espaol.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c9.bin
1d9ddcb1e2512bdb0f650f5006a10b5b8bef03ac9a21cc3817336e5ebd7f7647
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 5304 bytes
font_01_sfnt_off0000f5d5.bin
9ea386f790ce0c0bedb1c6b11e3c9e62f6d5407d320a9ec3065999d75c254aae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 10876 bytes
font_02_sfnt_off00011b2c.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 16092 bytes