Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bb85c99f4ee319…

MALICIOUS

PDF

69.6 KB Created: 2021-04-04 14:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c2ab110d5239d0bf06a498a8b0d0b594 SHA-1: 8063b16c0d4452389d0ff8eae1fb409d1b97e3e7 SHA-256: f3bb85c99f4ee319afe53f2dc2dddfb5bd680e3a72782aae4eaefd7606267d66
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/strik?utm_term=hec+hms+manual PDF link annotation
    • http://rozujed.sportsontheweb.net/bimutugatiji.pdfIn PDF document text
    • http://fowujuli.iblogger.org/adriana_lecouvreur_score.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495531/normal_5ffef7e35ea73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_60264aab26b65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366005/normal_5ff4bd5a1511e.pdfIn PDF document text
    • https://sikalejewop.weebly.com/uploads/1/3/5/3/135341852/nojekulikizuvotosum.pdfIn PDF document text
    • https://neposuxanu.weebly.com/uploads/1/3/0/7/130740617/6216562.pdfIn PDF document text
    • https://tepiduti.weebly.com/uploads/1/3/5/9/135974730/6ae7b17.pdfIn PDF document text
    • http://vir-tus.com/sokivezefotefuv7rvbq.pdfIn PDF document text
    • http://stickerrus.ru/curling_iron_reviews_consumer_reportso7t46.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/english_grammar_book_round_up_1_free_download.pdfIn PDF document text
    • https://xolejapu.weebly.com/uploads/1/3/4/4/134491856/4883059.pdfIn macro / runtime command snippet
    • https://fagadiroduk.weebly.com/uploads/1/3/0/9/130969360/butokeles.pdfIn PDF document text
    • http://dakajak.medianewsonline.com/xaliso.pdfIn PDF document text
    • http://megikinazemurel.22web.org/vinewofasifigezizabupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491933/normal_603e284ca7b38.pdfIn PDF document text
    • http://fruct.space/wood_bridges_freeohrpp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://telenusu.epizy.com/mutonodipapumi.pdfIn PDF document text
    • http://kemesuxaw.myartsonline.com/how_much_is_a_2020_dodge_charger_hellcat_redeye.pdfIn PDF document text
    • http://dopelafoxumamew.rf.gd/aumento_de_masa_muscular_hombres.pdfIn PDF document text
    • http://lekinip.epizy.com/axiomatic_fuzzy_set_theory_and_its_applications.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_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 4904 bytes
SHA-256: 7aee55a330681d9ba1157f91dfd7dfea783e5038f27f854ecfbdd2f45def9c9a
font_01_sfnt_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 10208 bytes
SHA-256: 199b3cfe3f1f195a6f0ffbe4e1f7dfca1562ab2c6ed1e27ad967ad7acd526d37

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