Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8aac6cc3f413226…

MALICIOUS

PDF

70.2 KB Created: 2021-02-18 22:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1ebe5335da9efa8d753dc66afc0ab1f8 SHA-1: 48eec391f60c9b9014aac723f2f995ab9033c447 SHA-256: d8aac6cc3f4132262ea25b812db42a7103361076951dbc742ef748f929a942bc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=black%252Bdecker+12+cup+programmable+coffee+maker+-+black+cm1100b+manual PDF link annotation
    • https://cdn.sqhk.co/minamojazi/8hdTuid/zona_top_up_game_murah_ml.pdfIn PDF document text
    • https://durajonuz.weebly.com/uploads/1/3/1/3/131383269/xevesadi_sokunalugikepe.pdfIn PDF document text
    • http://iciko.xyz/631607946772a0ey.pdfIn PDF document text
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/zezalasag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369506/normal_5fc69314a0eb0.pdfIn PDF document text
    • http://websecurer.tech/74220894450ncq87.pdfIn PDF document text
    • https://cdn.sqhk.co/gejemizus/ajiNrhc/pixel_s_unknown_battle_ground_offline_or_online.pdfIn PDF document text
    • http://ourfanz.com/reinforcement_and_study_guide_biologmlil2.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/Kjgghjc/tujarekivigisotidan.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/murelumobowitup.pdfIn PDF document text
    • https://sotinele.weebly.com/uploads/1/3/4/6/134640455/2828993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_60170e11be1c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/angular_limb_deformities_in_foals_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/8467098828.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/congo_music_mix.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_off0000d2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C4 5908 bytes
SHA-256: 02d44c32fb9686d7105ce265f2d581dc81c43d72c368c0561e4cb6642f5927ed
font_01_sfnt_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 10780 bytes
SHA-256: af1bd0c359b6527a3fbdb4d8dcf34ac00e945e865658ed8c0cd896308e1c04b0