Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cd742b3b8944fb…

MALICIOUS

PDF

79.3 KB Created: 2021-03-08 14:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c003ddf8ae36f664d44eb22f8d88a522 SHA-1: fb4cb15493faae575dae43812d8b700628001f19 SHA-256: b7cd742b3b8944fb6ea0e7762d91d5f21687aa32373835157864df4a6a75a236
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains references to 'Eyeconic tv guide' and 'wkhtmltopdf', suggesting a lure. Numerous external URIs are embedded, with one pointing to 'fokemale.ru', indicating a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/123?utm_term=eyeconic+tv+guide PDF link annotation
    • http://fodelogutejamit.getenjoyment.net/nulitubuvukate.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/the_silver_chair_release_date.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/kobutawesujiw.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/lg_refrigerator_lfx28968st_freezer_not_working.pdfIn PDF document text
    • http://kubojep.iblogger.org/9465363284.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/blind_moca_score_interpretation.pdfIn PDF document text
    • http://berilunowalaz.iblogger.org/gamitolekinuliful.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/mathematical_models_in_biology_edelstein.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lozufoxozaniso.rf.gd/ngo_bye_laws_format.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/nowudifuwemeno.pdfIn PDF document text
    • http://xegiseko.epizy.com/bufitajotize.pdfIn PDF document text
    • http://lobowubuzo.epizy.com/61197090983.pdfIn PDF document text
    • http://gevevobar.epizy.com/25877358216.pdfIn PDF document text
    • http://mulozeraxepe.epizy.com/sodojorexosakigof.pdfIn PDF document text
    • http://zedotedifajo.epizy.com/ascaris_egg_form.pdfIn PDF document text
    • http://ritumogadoj.onlinewebshop.net/rewetebotag.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/potudirobed.pdfIn PDF document text
    • http://xenezipulugiji.atwebpages.com/wired_for_story_ted_talk.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/what_exercises_do_you_do_with_kettlebells.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/bixezefifaxeliw.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/cash_for_apps_mod_apk_android.pdfIn PDF document text
    • http://ravuxigud.epizy.com/xonamosepimuvexagukidewe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 4708 bytes
SHA-256: 52a9aaa63c5edd639933b6fdbbec7f3b9bcaea0b1e6e6d0141b64d0a10193b10
font_01_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 11284 bytes
SHA-256: b8b5b4c4f685618f74611e112340c350c87aba6531ce90f5ece2e8e63eae8dc6
font_02_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 16120 bytes
SHA-256: 4ce8fb4fbbd22c538fbf3a5646dee362a242a1ef52e2bcf9a944a87feb8ab129