Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b63b58af7bb9e2…

MALICIOUS

PDF

74.2 KB Created: 2021-02-20 00:58:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0d0971d0e2b8f75365dd525b1441b47c SHA-1: 25ba4b6a851c30d00e00716be3fe60edb7033fa9 SHA-256: 19b63b58af7bb9e268cef5943735766ab6dccbc60ec5f14575a19a5c9c1672c3
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically designed to appear as a search result for 'what is a bachelor degree in public administration'. This URL redirects to another PDF hosted on disposable infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload.

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://baarspo.ru/123?utm_term=what+is+a+bachelor+degree+in+public+administration PDF link annotation
    • http://organic-ita.space/612567638117qkwm.pdfIn PDF document text
    • http://fapenas.22web.org/vehicle_registration_transfer_form_tamilnadu.pdfIn PDF document text
    • http://legendarycraft.ru/pvr_iptv_simple_client_zip_downloadaejk2.pdfIn PDF document text
    • http://hookup157.fun/junubuzivasumaxofavifa86glf.pdfIn PDF document text
    • https://cdn.sqhk.co/gitaligido/Cfhdbgi/pawubebuxowizorexekoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xenetomapum/iKjbSgd/97366232979.pdfIn PDF document text
    • http://fitnesspack.net/download_transparent_screen_and_live_wallpaperzfdr5.pdfIn PDF document text
    • http://geekcods.com/54275897392qrci2.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/gdSBgdN/fewubuwenagovabogapikawo.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/gjcaVX5/cars_for_sale_under_5000_near_me.pdfIn PDF document text
    • http://ultra0.space/solidworks_2020_tutorial_planchardlxw5f.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofovam/zjb0zgj/dragon_kingdom_names.pdfIn PDF document text
    • http://septiki-rf.website/magoletimusao0x89.pdfIn PDF document text
    • http://presalon.xyz/palufizu60kzf.pdfIn PDF document text
    • http://english-10.site/feveleroxariri9dlju.pdfIn PDF document text
    • http://fastgetme.online/final_destination_2_full_movie_in_hindi_480phlz5j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/guider_meaning_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/biographical_sketch_example.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/truck_air_brake_sound_effect_free.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_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 5640 bytes
SHA-256: 4cbdea3fc8e345845b05c3bad277d5b890c74ebad401fc554d1f521a7f30d0d3
font_01_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 11040 bytes
SHA-256: c49687d318ac69faa1e11f8374dde9d33f90684abb7b1993b480b18c6ae341b5

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