Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b263c4c8d0bdd9…

MALICIOUS

PDF

77.0 KB Created: 2021-02-17 02:19:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: cbcfde93ced8fe6ba2ec181d2666484a SHA-1: 4f9963068517088eb241472b5bf991a3a355d5bd SHA-256: 86b263c4c8d0bdd916ddcfa0d03aaffb1ce04532bcc9fb184072cae4e9794e64
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 pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/aws?utm_term=books+to+read+for+investing+reddit PDF link annotation
    • https://cdn.sqhk.co/mewowoji/VL8no5y/25168379886.pdfIn PDF document text
    • http://feedbacrnz.space/13246649962dxvfh.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/mefexavedibe-suwodasomewon-xorixepodipatev-nazodiga.pdfIn PDF document text
    • http://vehicleinsusa.com/45922691902gpisl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424011/normal_6012c30bb2419.pdfIn PDF document text
    • http://my-favshop.online/nulutedafopukivem5gxek.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/eElEh2x/alan_walker_greatest_hits_full_album_download.pdfIn PDF document text
    • http://ecoterritory.store/glade_air_freshener_safety_data_sheetq8sm7.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/jd0Q1PV/jukubidawuvamipob.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/ihjbjcZ/worlds_hardest_game_unblocked_games_66_at_school.pdfIn PDF document text
    • https://cdn.sqhk.co/litawoxelida/jfggXgc/touch_em_all.pdfIn PDF document text
    • http://1offpark.xyz/custom_radio_flyer_wagon_partsx766o.pdfIn PDF document text
    • http://jushq.pro/sixudi4lsz.pdfIn PDF document text
    • http://muzoc.xyz/graphing_systems_of_equations_answer_keybehgn.pdfIn PDF document text
    • https://fejiwapofiji.weebly.com/uploads/1/3/4/6/134699364/9877898.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/qlidBZJ/amazon_music_app_windows_10_64_bit.pdfIn PDF document text
    • http://hisgohar.site/stick_zombie_arena_0v3jvg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427287/normal_5ffd2efdb64a3.pdfIn PDF document text
    • http://tacfitproducts.com/vietnam_logistics_report_2018sy6ef.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
    • 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_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 5004 bytes
SHA-256: ae863f5aa594202834c4af8d3a65888e6d982fccff305f51840a54d483278d8e
font_01_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 10852 bytes
SHA-256: f7adec538ce586c89a8c8a654027a98cba1c92192ef10e7e93ec27dcdf2a6f2d
font_02_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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