Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ace1d128ce555fb…

MALICIOUS

PDF

124.8 KB Created: 2021-02-24 16:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 185cf9d85d11cccd6f126adeb121d7eb SHA-1: bbe3a9df213d6ab55a7b37715102d024538e2365 SHA-256: 8ace1d128ce555fb721674a32d24581678974d2f551f6466d5e3463d4921f73c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/123?utm_term=sony+xplod+100db%252B+reset PDF link annotation
    • https://cdn.sqhk.co/sugezigo/ggPheDL/mepobu.pdfIn PDF document text
    • https://cdn.sqhk.co/zitedefew/hUibjd8/ethiopian_construction_project_management_institute_address.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/navogew3az70.pdfIn PDF document text
    • http://pannochki-art.com/birthday_candles_giftfa46.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/cjdhjii/bare_knuckle_boxing_video_game.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/hgajbtI/mazes_more_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/gjgjijh/snapchat_upload_video_from_camera_roll_filter.pdfIn PDF document text
    • http://cashfree.store/dumamoneg7got.pdfIn PDF document text
    • https://cdn.sqhk.co/merivexasug/jj3c33a/download_jumia_ewallet_app.pdfIn PDF document text
    • http://springital.fun/gta_v_heist_guides3pqr.pdfIn PDF document text
    • https://tidepobowajaxuk.weebly.com/uploads/1/3/0/8/130814761/531802.pdfIn PDF document text
    • http://usesalon.xyz/subway_surf_hile_apk_indir_son_srm_2019v1m2m.pdfIn PDF document text
    • http://idclick.cash/sabrina_movie_imdb_parents_guideo0tmn.pdfIn PDF document text
    • http://rafewasugajeze.22web.org/bharat_movie_songs_pagalworld_mp4.pdfIn PDF document text
    • http://testrun.ru/3290372999vb2oy.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/8Ahaji6/cartographers_for_social_equality.pdfIn PDF document text
    • http://save50.pro/mapa_fisico_mundialz7d11.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/bupuzudig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://komusera.rf.gd/wufoduti.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9AF 5352 bytes
SHA-256: 4a19eba30841341967adf1d85370177766850266e4e19fcddd6a640032b2caba
font_01_sfnt_off0001bbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBFD 13268 bytes
SHA-256: a7797be326b8f3c776a62f407c0c22cd835e244d9e37bb149cf67f93b1c1163b

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