Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17334020f2d3277…

MALICIOUS

PDF

76.7 KB Created: 2021-03-24 09:23:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b29c22c6ce2c2200acb23a522839ea91 SHA-1: 184b12feaf58acd7decb1e5b85c878bbb15e433a SHA-256: f17334020f2d32779b9cb84af53e4d9a0f877fb13ecdf2beffcbdd7962a78af0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain 'jottigo.ru' that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, further supporting a malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest malicious activity.

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/wix?keyword=blood+spatter+lab PDF link annotation
    • http://gogejevi.iblogger.org/structural_family_therapy_assessment_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/vosiwuli/vPFqmjc/wejazosujerevewiwinek.pdfIn PDF document text
    • http://goxezidoge.22web.org/camminiamo_sulla_strada.pdfIn PDF document text
    • https://vefupidukubimaz.weebly.com/uploads/1/3/4/5/134597042/c4ff47.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/bgi0NzA/67520365261.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/8PheN0i/stickman_fight_game_for_pc_download.pdfIn PDF document text
    • https://mapogukokerezat.weebly.com/uploads/1/3/5/9/135987870/tugutiguxet_xowebikukex_jumubebinefirel.pdfIn PDF document text
    • http://gijipodotetojo.22web.org/horntail_prequest_guide.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/konukifilosefodigarilifok.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/36239985398.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/zozeregifejaki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rulamiji.onlinewebshop.net/gemezutewinixixa.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/gusidejazexave.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/how_long_does_it_take_for_evening_primrose_oil_to_work_for_labor.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/58553298818.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/how_to_get_directions_in_google_maps.pdfIn PDF document text
    • http://tunajuxogililog.epizy.com/cancer_information_specialist_american_cancer_society.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_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 5140 bytes
SHA-256: fe1d86c01e1c2ac7deeb28739e745f46f02912068f9bf4c12d7de2630c4170c0
font_01_sfnt_off000101e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 10836 bytes
SHA-256: d3e5e4c376c47dbc6cadfcb70f498da6db136f88e8e4ad7fffd433588e76ca54

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