Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6c797eb5f00193…

MALICIOUS

PDF

71.7 KB Created: 2021-02-25 19:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6a7c15cac7859337f80c8c7ef62d7542 SHA-1: 409de52cbe89bae4872580c46aabc75d59cd5016 SHA-256: ab6c797eb5f00193372ae3e469a24b7d14a219c2407b99a964e1c9872b7e9295
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 or trojan. It contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or suspicious-looking domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/award?keyword=how+great+thou+art+ukulele+chords+carrie+underwood PDF link annotation
    • http://christinaanddavid2019.com/pavurc64z2.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/on_becoming_a_person_book_depository.pdfIn PDF document text
    • http://kataeta.club/oracle_sql_developer_installation_guidemj075.pdfIn PDF document text
    • http://geniusenglish.space/sql_server_management_studio_17_format_sqlxci9j.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/richard_rorty_achieving_our_country_summary.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/60291400560.pdfIn PDF document text
    • http://detonic-italia.website/zajanino2sdee.pdfIn PDF document text
    • https://cdn.sqhk.co/wupofolizaj/QujcKbc/96865396486.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widifusi.myartsonline.com/kisujawa.pdfIn PDF document text
    • http://kuzadimizu.epizy.com/how_to_work_in_operations.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/how_to_train_for_half_a_marathon_beginners.pdfIn PDF document text
    • http://xodupope.epizy.com/bahamas_passport_application_form.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_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 5320 bytes
SHA-256: 228b3121888de1136bedf2cf34254b6beb0f9e9f9de70a38cb647f4bc2e2a76a
font_01_sfnt_off0000ea46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 12060 bytes
SHA-256: 3b031a099e05a39a9c7c6ebd83db411d3fc232074f60b9893278befb8d95ad53

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