Malicious PDF — malware analysis report

Static analysis result for SHA-256 80584b26c22c13d2…

MALICIOUS

PDF

73.8 KB Created: 2021-02-21 03:06:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d27025d76ae2897724299f192eb98167 SHA-1: 5e162f40de802fe6267f030fd13d1ca98e645dc7 SHA-256: 80584b26c22c13d2cd6955d5e58fb696865bf87d0b9a7e53bfccf1d683bc8dd7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many hosted on disposable domains and subdomains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. The embedded URLs and the structure of the PDF point towards an attempt to redirect users to potentially harmful content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/123?utm_term=50+to+1+fuel+mixture+calculator PDF link annotation
    • https://cdn.sqhk.co/jilebodetifa/jghggeJ/alan_walker_faded_song_piano_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/cpjcPie/space_needed_for_air_hockey_table.pdfIn PDF document text
    • https://fidagavatijib.weebly.com/uploads/1/3/1/3/131398583/f09e3.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/ghicLii/ewallet_definition_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/rmhjPmG/mcat_registration_deadline_2019.pdfIn PDF document text
    • https://siromalad.weebly.com/uploads/1/3/5/3/135312661/3303177.pdfIn PDF document text
    • https://makumanufomogo.weebly.com/uploads/1/3/0/8/130874647/kosofategin.pdfIn PDF document text
    • https://cdn.sqhk.co/vigamodijek/fhhaieW/planet_fitness_los_angeles_midtown_ca.pdfIn PDF document text
    • https://valabokewem.weebly.com/uploads/1/3/5/3/135311070/batowebudeva.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/AJwia1R/day_r_premium_1._670_apk.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/61bfa.pdfIn PDF document text
    • http://xonejixa.22web.org/razasaxozukulugibofipug.pdfIn PDF document text
    • https://degexaxi.weebly.com/uploads/1/3/1/4/131406510/suseluxajulofo.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/ac3Vhex/miraculous_ladybug_season_4_episode_1_release_date.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 5140 bytes
SHA-256: 83f9fc5228df8cc7517ac572fe1701bba6d21cd343666fa9bdb27edace2d1ef4
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 11036 bytes
SHA-256: b9d5934f2e63a86a2c066409531363fdf8661451f0c5b5ab990b25b1936189ac

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