Malicious PDF — malware analysis report

Static analysis result for SHA-256 480663569cf0d875…

MALICIOUS

PDF

75.6 KB Created: 2021-03-04 22:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 99fde11a749b91867cd584edcb307f5c SHA-1: acfb39ee0b73a226842b58b81022a597a0faf6b5 SHA-256: 480663569cf0d8752d51edff80ee6367488eafd026eae963643d4e079457d286
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs disguised as links to free audiobooks, with a prominent link to 'fokemale.ru'. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it with high confidence. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

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://fokemale.ru/strik?utm_term=funny+audio+books+free+download+reddit PDF link annotation
    • https://sirutobij.weebly.com/uploads/1/3/0/7/130776617/femodumuginalofogex.pdfIn PDF document text
    • http://tdsevsvet.ru/viwekodafixajudif8zd31.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/dell_b1160w_wireless_setup.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/how_to_repair_a_richmond_water_heater.pdfIn PDF document text
    • http://ita-yog.space/43593279248ua3un.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/heLoidB/guide_for_zepeto_advice_avatar_maker.pdfIn PDF document text
    • https://sixalusizefew.weebly.com/uploads/1/3/1/3/131378898/0715af.pdfIn PDF document text
    • http://interstart.online/flower_art_designsmeffc.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/lady_of_the_lake_witcher.pdfIn PDF document text
    • http://xagidodovinudu.iblogger.org/qsc_touchmix_16_multitrack_recording.pdfIn PDF document text
    • https://pixumoxijabana.weebly.com/uploads/1/3/4/7/134748481/nilifugerabov.pdfIn PDF document text
    • http://dekofunafakutiv.22web.org/batman_and_psychology_audiobook_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/6xVLDLA/hero_xtreme_200r_on_road_price.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/bexavadimezilederenuleve.pdfIn PDF document text
    • http://kprovk.xyz/how_to_keep_summer_infant_monitor_onoe7h3.pdfIn PDF document text
    • http://modebedunizux.iblogger.org/petenawelonuxojowovebape.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufalejopasedor.epizy.com/95691563854.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/lupanasasoxufexitopubi.pdfIn PDF document text
    • http://duzifif.epizy.com/tomtom_n14644_update.pdfIn PDF document text
    • http://lajirobodogew.epizy.com/57239279260.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_off0000ea54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 5256 bytes
SHA-256: a5e422efde20422f33bf17a555d645f8a8fdbf2bc448b8b2c3c07e301875c053
font_01_sfnt_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 10732 bytes
SHA-256: 31e19ce0ead701070f055283b3bc4d24f7bc539bb7a940667d1c0f636fc01c83

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