Malicious PDF — malware analysis report

Static analysis result for SHA-256 002e3bc2eead110e…

MALICIOUS

PDF

86.6 KB Created: 2021-03-19 08:27:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f1cebe911d97a4aaa363d63d342c3287 SHA-1: 9c272129673b863c2c00aa72b0595be752880b7d SHA-256: 002e3bc2eead110e9dddffa8f551aae619142855f63dff6384b38199d0549b45
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'maypoin.ru' and a query parameter suggesting a lure related to a textbook. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a phishing or malware distribution scheme. No scripts were extracted, but the presence of multiple external URIs suggests the document is designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=data+structures+and+algorithms+in+python+textbook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408871/normal_601ae57849688.pdfIn PDF document text
    • https://cdn.sqhk.co/wukopojenava/igOyvig/ge_bluetooth_smart_switch.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/kobaxedafojasu.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/1gcgjja/judorajom.pdfIn PDF document text
    • https://cdn.sqhk.co/rebabafa/jibiijb/badlands_national_park_weather.pdfIn PDF document text
    • https://cdn.sqhk.co/vofosutuwo/ghjbdoi/shark_eating_whale_bulli.pdfIn PDF document text
    • https://cdn.sqhk.co/retirijozi/gcf4ici/20094654471.pdfIn PDF document text
    • https://cdn.sqhk.co/xidizizo/gcfMqje/dasopututilibejaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482020/normal_5fca89096dc35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458413/normal_603aac63812c0.pdfIn PDF document text
    • https://cdn.sqhk.co/kapipota/hdypAgj/ice_cream_shop_cherry_hill_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/1kIib19/71835246957.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458634/normal_5fddaffd2e618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_604b7eda56666.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411498/normal_5ffcf412e576f.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/gy4UTy1/39964584553.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/the_iliad_robert_fagles_ebook.pdfIn PDF document text
    • http://wififej.mypressonline.com/caperucita_roja_en_ingles_y_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/zugivakizo/fjj0jgx/craftsman_tool_box_set.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/is_cbd_oil_legal_in_ncaa_sports.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://korofituzuxigu.onlinewebshop.net/canada_provinces_map.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_off00011074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 5860 bytes
SHA-256: 88a32217bc76ecddf3b9c2f2efb0cbcd07ca859bea813014365be65ead118471
font_01_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 11404 bytes
SHA-256: 62f5869d332694771e522cb655e8fd75095897cd3bb584a90560511829690d9f

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