Malicious PDF — malware analysis report

Static analysis result for SHA-256 892ca0f4c96267e5…

MALICIOUS

PDF

75.4 KB Created: 2021-02-28 14:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a578688abaa92e056ada5e702564cda6 SHA-1: 032b3e9c9ef0c3a66308bcc9d723b3e0223cf885 SHA-256: 892ca0f4c96267e5d250328b038602c55bde9549146df0e19f9c4edd70b8abb2
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=homelite+super+2+chainsaw+specs PDF link annotation
    • http://cucoupon.info/lagu_lily_versi_koplo_beny_sonatab26gp.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/lpjgVQT/75294189598.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/igagiih/chicken_scream_iphone_games.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/jh1Jjbe/24212602857.pdfIn PDF document text
    • http://all-gopro.com/how_to_convert_to_kindle_format_on_macp148o.pdfIn PDF document text
    • http://baffer-shop.space/33351641040l8qln.pdfIn PDF document text
    • http://alkostore.xyz/why_does_my_hp_printer_keep_saying_paper_jamyo2s4.pdfIn PDF document text
    • http://itdomen.fun/powirubegokadunogaknr4jw.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/ighauic/the_defender_mod_apk_of_temple_run_2.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/sujfjcl/pubufidadime.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/7ijjfcP/2414830518.pdfIn PDF document text
    • http://egosikenclub.com/69121541991nmfnt.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/rjgPSgg/ahs_amino_for_american_horror_story_the_house.pdfIn PDF document text
    • http://usacarins.com/analisis_literario_veinte_poemas_de_amor_y_una_cancion_desesperadadmtuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moretavumafoge.epizy.com/trombosis_venosa_profunda_cuidados_de_enfermeria.pdfIn PDF document text
    • http://sejonigimanam.epizy.com/18571856203.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_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 5360 bytes
SHA-256: ab70b044bee7b90a05b80509aea40dcb3e62011a6ae61f048b7e57be29bbf6f8
font_01_sfnt_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 11020 bytes
SHA-256: 2f20c260ba0321e021544413604dbf0af30946511112168b762f9320d2b6650a

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