Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8c8561c802df5e…

MALICIOUS

PDF

83.1 KB Created: 2021-04-06 05:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 97b4bb99d681846c27958a4d6d3cd1ca SHA-1: ea858509002383d27be08dffc1b136c6c2b0e67f SHA-256: ae8c8561c802df5ea2ecf5d8c6b8f8f23d2f088bc2c0c2fb94547918ec85676d
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 hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs point towards a phishing or malware distribution attack pattern, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=air+conditioning+types+pdf PDF link annotation
    • http://sevesasineja.22web.org/adobe_reader_full_offline_installer.pdfIn PDF document text
    • https://cdn.sqhk.co/mogilirexexa/jfNogeN/death_shooter_4_mission_impossible_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/LP8gidC/kumogukavu.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuzoda/vHhfyij/93042741282.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/chromosome_structure_and_organization.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/gPYrHjf/cod_cold_war_release_date_uk_time.pdfIn PDF document text
    • http://ximekitezup.iblogger.org/brazil_song_malayalam_2018.pdfIn PDF document text
    • http://fanuvazav.scienceontheweb.net/veruzizabuxaxubojub.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/yhiOT5h/56496859810.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/ngdFSgY/pajuturidasexa.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxuduxexi/1dmjj2m/91890931492.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/lhbhigf/98696960307.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/tanapilamaxi/56588424965.pdfIn PDF document text
    • http://gixufedexakav.atwebpages.com/98082663391.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_af2e6e0daa9042c585a8bbd97f9e7782.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/norton_antivirus_for_windows_10.pdfIn PDF document text
    • http://dinotowiteve.rf.gd/wupugodedof.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_0541baf9c6fe40b593dbf28d446061ab.pdf?index=trueIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_b9e8eb3d6b944f3694b6b93c73fc0984.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gawabog/guitar_neck_notes_game.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_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 5172 bytes
SHA-256: a7fa3fbd2ca31bef630283f4adcd35b5f23eece6dd42b66e60799f8d1f36b504
font_01_sfnt_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 11204 bytes
SHA-256: 2199bd713fac78bb9c38ec2d3650b9aa6b9dc0d24ea03a308ba7b3b09a747179
font_02_sfnt_off000129ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 16132 bytes
SHA-256: 0845746d8e0f76c2c57e53a5d0c2d2ba36ed31c4724e2802406f297ba1795667