Malicious PDF — malware analysis report

Static analysis result for SHA-256 391d434df88e3c2a…

MALICIOUS

PDF

74.9 KB Created: 2021-01-17 11:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1c5ee22c2e0f87e7e63295ccbf51e8d2 SHA-1: b53f126d727011b422ecf097ea2ea875c0ec7f18 SHA-256: 391d434df88e3c2ad442db6c8e357857689e241fbf5f9b3837942389d33cbca9
134 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with a 'utm_term' parameter suggest a phishing or scam attempt to trick users into downloading further malicious content. ClamAV detection confirms the malicious nature of the PDF.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?utm_term=canon+ip2700+series+driver PDF link annotation
    • https://site-1211890.mozfiles.com/files/1211890/free_brain_games_for_adults_printable.pdfIn PDF document text
    • https://site-1204780.mozfiles.com/files/1204780/kendo_grid_mvc_command_template.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/ig3ugiz/funny_short_video_clips_for_whatsapp.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/cgdliab/craigslist_ny_staten_island_cars.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/Kijdje1/austin_mahone_ringtones_free.pdfIn PDF document text
    • http://vabuzunaseridal.iblogger.org/zurofujonej.pdfIn PDF document text
    • http://kepojitu.22web.org/99919301123.pdfIn PDF document text
    • https://cdn.sqhk.co/mabuviko/HFhahjH/kung_fu_panda_3_netflix_country.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/2yX8Kow/stickers_whatsapp_memes_descargar_gratis.pdfIn PDF document text
    • https://site-1176202.mozfiles.com/files/1176202/dijaditukazo.pdfIn PDF document text
    • https://site-1177895.mozfiles.com/files/1177895/43616181362.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kadegezopofog.rf.gd/tovalonuked.pdfIn PDF document text
    • http://webubekesivamuf.epizy.com/78219915932.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/baby_songs_tamil_movie_video_free.pdfIn PDF document text
    • http://lenixad.epizy.com/62232780525.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/38162035940.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/bajirao_mastani_full_movie_720p_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/59188157352.pdfIn PDF document text
    • http://renirujetumofid.epizy.com/mipusuxe.pdfIn PDF document text
    • http://nulesuli.epizy.com/adam_lambert_american_idol_season_8_performances.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_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 5240 bytes
SHA-256: 10966b173269b4dbf9ccd9b81055d1f6957c7b2bac8d4f2a90b12a8c7cb77800
font_01_sfnt_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 14004 bytes
SHA-256: 627eeb642801458aab5148ed7fc74ced7dbe64ee8d9de5fb9ccb7c4ae9462e44

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