Malicious PDF — malware analysis report

Static analysis result for SHA-256 e186f7452706aad3…

MALICIOUS

PDF

70.6 KB Created: 2021-02-13 09:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 447b448562178a7e19fb2b23ce381b0a SHA-1: 70a0495620e4d5ce71eccce902ff9d343986b9ad SHA-256: e186f7452706aad33bbf53e0c828b99ab56caec9dd94ceb44452ea2b4145d1a8
194 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. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external URIs and the link farm heuristic strongly suggest this document is part of a phishing campaign or a malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/123?utm_term=combat+judo+pdf PDF link annotation
    • http://losinglotterynumbers.com/tulopanitafonumaly5tnd.pdfIn PDF document text
    • https://nibonitet.weebly.com/uploads/1/3/0/7/130776737/xadeduma.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/icOgisL/stickman_gunner_game.pdfIn PDF document text
    • http://creditinquiry.info/45898331744r0cdq.pdfIn PDF document text
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/kunigixajodesolirawo.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/9671a38a10bc.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/nerudusuzefux.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/MhfCLUy/chore_charts_for_8-_9_year_olds.pdfIn PDF document text
    • http://dazixetenulega.22web.org/suspicious_activity_report_uk_template.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/jgePghq/bogezubi.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/SghLjir/sad_alone_status_malayalam.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/shaffer_social_and_personality_development.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/hgifiaY/selling_food_on_etsy_canada.pdfIn PDF document text
    • http://wozufilugud.iblogger.org/74091040594.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/tuzakifezara/affiche_de_cinma_grand_format.pdfIn PDF document text
    • http://xuzezomitan.rf.gd/short_relaxing_guided_meditation.pdfIn PDF document text
    • http://kalilom.epizy.com/beginners_guide_to_starting_your_own_business.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_off0000d903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 5004 bytes
SHA-256: bb1cc9cf6fda5ab645ed9133050d0d26cdfbf8594cb32bc62b9fc71775b1bf6e
font_01_sfnt_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 10620 bytes
SHA-256: 68f913f75cf3a13992fe7b154cb1f375feb90f508cd69003bf639d31363ad8af

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