Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f00e00eee6ec9b…

MALICIOUS

PDF

73.9 KB Created: 2021-02-17 16:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 345c53f11167f20f7e9a2db9ca1db375 SHA-1: 6a4bb7b26139b0ec1ef4e6389475a5b6830b443e SHA-256: 12f00e00eee6ec9b54a68e184fa53b383d1208c04bc88cdb7a9325191bbf66b0
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URIs, many of which are hosted on disposable domains. The PDF's structure and embedded links suggest it functions as a link farm, directing users to potentially malicious content under the guise of a book download. No scripts were extracted, but the presence of multiple external links and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=where+do+i+come+from+book PDF link annotation
    • http://prostotit.site/vagekotimixumobodqrs90.pdfIn PDF document text
    • http://xetelafeke.iblogger.org/metro_map_paris_france.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/Bggw2jo/munifoxera.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/glhczhc/x_plane_flight_simulator_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/k0gtQic/pokemon_home_3ds_to_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/kupibetefuko/k3xzihO/spinner._io_hack_download.pdfIn PDF document text
    • http://skidki-day.shop/flixster_video_redeems6ucv.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/UT2hjig/12431954261.pdfIn PDF document text
    • http://pitushok.fun/1051194117t6k8e.pdfIn PDF document text
    • http://beamorem.com/google_street_maps_ukfreff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tefabawamibane.epizy.com/australian_drinking_water_guidelines_2011.pdfIn PDF document text
    • http://towawemigegi.epizy.com/38336156155.pdfIn PDF document text
    • http://sebiwafexudezo.rf.gd/birdlike_freddie_hubbard_sheet_music.pdfIn PDF document text
    • http://tokafibalo.epizy.com/river_wye_paddling_guide.pdfIn PDF document text
    • http://xidijunuv.rf.gd/tubipinezavebigivutiwudum.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_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 5060 bytes
SHA-256: 1adbe33c323fb31a24703a1e82244963d4f915df36f5dd372f99abf1f7b819b4
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 11200 bytes
SHA-256: f3bbcdd703e48cc47848699d679e62222a176c8208680771698fd2fa754b38de

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