Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb847d317e77eea7…

MALICIOUS

PDF

84.0 KB Created: 2021-02-27 15:18:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 25ef25696ee66ae14e73d0a05a281ead SHA-1: df8d1ef4d6da05220721d1de4e55bb3977faef77 SHA-256: bb847d317e77eea739c58bf165048dc0fcee423660a17d2a2aa3a509df07fed3
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 trojan. Heuristics indicate it functions as a link farm, hosting numerous URLs on disposable domains, with a high concentration of links per host. The document body, though heavily obfuscated, contains references to 'dog temperament test online' and 'wkhtmltopdf', suggesting a lure to a potentially malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/aws?utm_term=dog+temperament+test+online PDF link annotation
    • http://lakshmi-store.ru/earthbound_jobs_near_mejlf8j.pdfIn PDF document text
    • http://likelid.xyz/how_do_i_reset_my_weight_watchers_points_plus_calculatorlog1e.pdfIn PDF document text
    • http://datingdate.site/20638583819o4ckd.pdfIn PDF document text
    • https://cdn.sqhk.co/kefesizo/j7icjdw/hp_smart_app_for_apple.pdfIn PDF document text
    • http://hightrade.club/70579266949nzbgu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_600e5e22cdc62.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/Vughyhf/management_consulting_services_sic_code.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxibila/nyr6jaJ/fashion_design_world.pdfIn PDF document text
    • http://scandisvet.ru/appradiolive_navigation_appnit13.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/mouse_guard_books.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/GZOChid/wapuz.pdfIn PDF document text
    • http://xilenemivagola.mywebcommunity.org/vibewejixire.pdfIn PDF document text
    • http://avtovishki-msk.ru/89231981329b1isg.pdfIn PDF document text
    • https://cdn.sqhk.co/taviboku/g5JApha/26161269097.pdfIn PDF document text
    • http://mamontov-net.cc/54497555476hp7yt.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/xkjiPkk/rocket_launch_schedule_wallops_island.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470552/normal_5fd77eb95bb2a.pdfIn PDF document text
    • http://storezone.info/20275463918yrx7e.pdfIn PDF document text
    • http://meetchambre.xyz/sunset_description_quotes5he7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijiwaras.onlinewebshop.net/what_is_a_good_beginners_wine.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_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 5136 bytes
SHA-256: 126b6832983804a7522bce6cbbe8828d922c6f6ff894bfc579c7dad413bec81c
font_01_sfnt_off00011cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 11160 bytes
SHA-256: c7767c77f327278c046689cdd496d6aad47272d193f550c21a2698105595c210

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