Malicious PDF — malware analysis report

Static analysis result for SHA-256 40651326355324f7…

MALICIOUS

PDF

77.0 KB Created: 2021-04-04 19:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 24bc8c11f808d37c424ccc0699dcd4f3 SHA-1: a932f8a1469875f20046f88617934434d61ce27a SHA-256: 40651326355324f746903413a18d2e08f5b871c985e9020bf38b924aa8c5c60f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/123?utm_term=aseprite+palette+format PDF link annotation
    • http://dogalijun.scienceontheweb.net/technical_drawing_definition_and_examples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_5fe81898c3170.pdfIn PDF document text
    • http://fovoxarofej.getenjoyment.net/wine_enthusiast_18-bottle_dual-zone_wine_refrigerator.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/fmhfd6G/zikololuwudow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5ffe4d4080a55.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/iey0Nja/hocus_pocus_max_dennison_x_reader.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/68842458553.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/solid_principles_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_6059b20863456.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/liwanoregulok.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/Xifljcv/ocean_floor_rift_zone.pdfIn PDF document text
    • http://suruxawabasi.iblogger.org/91676054170.pdfIn PDF document text
    • https://cdn.sqhk.co/podogule/zaijggL/36573363557.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vupikefugogulup.epizy.com/gosipisikisepalajogisi.pdfIn PDF document text
    • http://tinegomawula.epizy.com/auto_typer_by_murgee_v1._10.pdfIn PDF document text
    • http://zepibugab.rf.gd/jadojigam.pdfIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/zaxuboneriwozapexum.pdfIn PDF document text
    • http://wipezusefoxilu.rf.gd/payment_of_bonus_act_1965_amendment_2020.pdfIn PDF document text
    • http://nawulariwataxut.rf.gd/50271953041.pdfIn PDF document text
    • http://mevusajilitum.rf.gd/80624460158.pdfIn PDF document text
    • http://varirojemixu.myartsonline.com/50025675996.pdfIn PDF document text
    • http://tiredosutozol.atwebpages.com/subixajidudolazelak.pdfIn PDF document text
    • http://xanedemu.onlinewebshop.net/83753508335.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_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 5036 bytes
SHA-256: 79b1bab38a026392b3795ece8c33d1da7868cea35a75b4b12a748d006e21b94c
font_01_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 11004 bytes
SHA-256: dc135606bbf63d574a1315fb4cd91f4dd7d1b2e6377733c705f1d76b783e3e14
font_02_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 16320 bytes
SHA-256: 7947bdf96a9dbdfcb7444b8d1e661a60fd8de6cfece6fb185cdd9bc5f709d322