Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7754c068111b85e…

MALICIOUS

PDF

87.5 KB Created: 2021-04-14 10:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3aa62dfa8044fa2ced88c2fa4b0c90b SHA-1: 5da6ce01cd632c8000a473671e19795bbcb9de15 SHA-256: b7754c068111b85ea7a42af2c7af4576d42b6031f6d675ee2730a5ef2a35e191
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external URIs, including one pointing to `https://pelibifir.ru/strik?utm_term=arduino+mega+2560+digital+pin+voltage`. The presence of a PDF_SEO_LINK_FARM heuristic further suggests the document is designed to distribute links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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
  • 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://pelibifir.ru/strik?utm_term=arduino+mega+2560+digital+pin+voltage
    • https://cdn.sqhk.co/tajudozizif/QtiigeP/40502543581.pdf
    • http://yesstore.pro/150127271911w8xm.pdf
    • http://raisinshub.club/numl_application_form_20198e1w8.pdf
    • https://cdn.sqhk.co/lojibuwe/ge5jJtv/human_gangs_epic_battle_simulator_mod_apk_revdl.pdf
    • https://zodekunomaxuj.weebly.com/uploads/1/3/0/7/130739112/4e4b8.pdf
    • http://kexolifowuj.medianewsonline.com/autonomous_weapons_systems_law_ethics_policy.pdf
    • https://xekukagakodepa.weebly.com/uploads/1/3/3/9/133999272/buzuzexanoke.pdf
    • http://meetplafond.xyz/muxubavegijx85pe.pdf
    • https://cdn.sqhk.co/vagofedewat/kFggX5D/40988565729.pdf
    • http://beviluxenumiliv.mywebcommunity.org/94321705258.pdf
    • https://cdn.sqhk.co/dasotipamu/HgeYhjD/fan_led_control_system_remote_not_working.pdf
    • http://alcozerox.com/juruzudujivaxwshjy.pdf
    • http://spoonnumberone.xyz/famous_jane_jacobs_quotes660d3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rimepusox/84683396410.pdf
    • https://s3.amazonaws.com/kezemiradigu/dingbat_game_answers.pdf
    • https://s3.amazonaws.com/minaxigevani/roxajabajukiretatot.pdf
    • http://limufij.myartsonline.com/50229562544.pdf
    • https://s3.amazonaws.com/gowupuzokowuxes/dagadigoguxavinugov.pdf
    • http://kilarosine.atwebpages.com/84603506023.pdf
    • https://s3.amazonaws.com/nabifovu/rukegil.pdf
    • https://s3.amazonaws.com/tolivajupeku/30909472719.pdf
    • https://s3.amazonaws.com/wuvepilamamuse/the_splendour_of_the_king_bible_verse.pdf
    • https://s3.amazonaws.com/mejados/thermodynamics_and_statistical_mechanics_problems_and_solutions.pdf
    • https://s3.amazonaws.com/xovekolamoxe/95206227518.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010af1.bin
b80c49a2df7d2a723e7516e18651773d1b202a4808b527547b0db8691ada6eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 5584 bytes
font_01_sfnt_off00011dd0.bin
314d196276d605464707f40592cf4fb774e24cc8cee3e5e2cf8af4d9fa2907bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 10560 bytes
font_02_sfnt_off000141fc.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141FC 4324 bytes

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