Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0457f1a74625d2…

MALICIOUS

PDF

85.8 KB Created: 2021-03-27 17:35:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f18fa1ca287a1d83e8b21bcefcd637bf SHA-1: 738f2e7e71e9289e10aab6124d8eec7c32c542c2 SHA-256: ef0457f1a74625d2630cfaeef66adeee4f57cf8c95f0648cbba7f108aa726d14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/award?keyword=adding+text+to+pdf+files+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414498/normal_5fdfa9e5b8275.pdfIn PDF document text
    • http://xeberok.getenjoyment.net/celiac_disease_book.pdfIn PDF document text
    • http://mimivamefigupe.sportsontheweb.net/97419722108.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/tepurimowo.pdfIn PDF document text
    • http://tarageleg.iblogger.org/functional_and_nonfunctional_requirements_in_software_engineering.pdfIn PDF document text
    • http://fullstacket.online/24213185217eoeit.pdfIn PDF document text
    • http://fosakilatugok.iblogger.org/root_cause_corrective_action_template_excel.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/hfgjiDa/giant_defy_3._5_size_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/Shh8ggX/knife_hit_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/dojerilu/geighhr/shotgun_sound_ringtone_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/memenewo/ehjhcDd/unblock_car_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449776/normal_5fc9131fdd089.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/panasonic_kx-tge270_factory_reset.pdfIn PDF document text
    • http://fojukivijivik.medianewsonline.com/pazataxabebesanetavabapa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490366/normal_5fcb355674a62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5fd9c4fc47a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_6033d024a5638.pdfIn PDF document text
    • http://pobadabodoz.scienceontheweb.net/free_phonemic_awareness_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zefinotobi/RhaEQCF/zivopetogelokib.pdfIn PDF document text
    • http://senteber.site/kanata_hourly_weather_reportd7lp9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kalawutef.rf.gd/20281779971.pdfIn PDF document text
    • http://wobemiko.epizy.com/how_do_i_fix_my_hp_officejet_pro_8600.pdfIn PDF document text
    • http://guxejusoselota.myartsonline.com/wesufuraloxigotofanalaros.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 5056 bytes
SHA-256: 6b26a175fdf14af6f8fb1f11462918a6b6de6489f3015250dfada460faf13ec6
font_01_sfnt_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 11128 bytes
SHA-256: 76a0c43f0be3e752d56ed5d87cb74af32b5a898eeabd3ab4e56f5abc2a09cb54
font_02_sfnt_off000134b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B1 16060 bytes
SHA-256: 10572f3a10760712fbb8352e098d229fd21f48763f52fb6fd9385479015ceb58