Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58862f885197514…

MALICIOUS

PDF

75.5 KB Created: 2021-03-13 16:17:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a79fb5452e755e38a8a374b86e2c74b5 SHA-1: a3e8a3ad5182060284260b607d5971b465caa88f SHA-256: c58862f885197514a6bcb96419e138d793525eac715aeebf6c14acdaec0d6bb0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=cambra+caries+pdf PDF link annotation
    • https://cdn.sqhk.co/xusarukave/jMsQyhi/jumia_black_friday_2019_samsung_phones.pdfIn PDF document text
    • http://carishr.com/checkliste_vorstellungsgesprch_fragen_arbeitnehmerotixh.pdfIn PDF document text
    • http://alex-chekalev.com/1581424756265nsf.pdfIn PDF document text
    • http://kyhni.site/reloading_supplies_tyler_texaso03nb.pdfIn PDF document text
    • http://topsale.pro/bekunonumakanojizetolobkyv2.pdfIn PDF document text
    • http://cg-designer.xyz/guia_oficial_dark_souls_36aay8.pdfIn PDF document text
    • http://feelslike35.com/what_is_the_tallest_pyramid_in_ancient_egyptr2k87.pdfIn PDF document text
    • http://mmmuuuue.space/shree_gurudev_datta_mantra_benefitsv7ht0.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/wurokiburesoketu.pdfIn PDF document text
    • http://wgathering.org/what_are_the_birthdays_of_the_harry_potter_charactersyg6lm.pdfIn PDF document text
    • http://pixell.store/gatexopoz38cvf.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/640220.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/mjjNges/gugupedevajofidoponaf.pdfIn PDF document text
    • https://lekofubazag.weebly.com/uploads/1/3/1/8/131872104/88f36.pdfIn PDF document text
    • http://itnegozio.info/jefexanolosegojapnn.pdfIn PDF document text
    • http://hurricane1.space/ontological_coachingpytrk.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/hPOieU6/black_friday_every_day_smart_online_shopping.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/feliso/tejumojigalate.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/shiver_me_whiskers.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/hp_envy_4500_printer_scanner_software.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/adobe_premiere_pro_2016.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_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 5316 bytes
SHA-256: 4ec26cce5816d49f1681196b946b5775f938b2d968c46efabd6d4a76076f3403
font_01_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 12300 bytes
SHA-256: 9816159779f8efd77e2c090b6cff051a90539fc8c877674db3bcd20f2cee767b

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