Malicious PDF — malware analysis report

Static analysis result for SHA-256 28071470b491bf5c…

MALICIOUS

PDF

79.7 KB Created: 2021-05-07 10:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 23aceed11916522cd765bf9de1cedd75 SHA-1: 280c806506fd0a78b245c910e9f6f9e4fe378d5f SHA-256: 28071470b491bf5c11248c0b243aafb24815d17ac10750ee73d8f17512ac7d6b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=what+is+my+star+sign+if+i+was+born+today PDF link annotation
    • http://vogusazujijufo.22web.org/how_many_journey_to_the_center_of_the_earth_movies_are_there.pdfIn PDF document text
    • http://alcozerox.com/34695072931x5sxr.pdfIn PDF document text
    • http://tk-pobeda.site/pepanufugujol2sq2.pdfIn PDF document text
    • http://sallehq.xyz/91789102371eqmk1.pdfIn PDF document text
    • https://cdn.sqhk.co/zonigita/jcOZZje/omron_blood_pressure_monitor_cuff_wrapping_guide.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/68993651471.pdfIn PDF document text
    • http://znohist.site/70768427335dwgmv.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/bPhcjge/88986245485.pdfIn PDF document text
    • http://tranquils.space/43668916784l2u2v.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/how_to_put_midi_files_on_garageband.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/sonicwall_tz_105_configuration_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/jghPOyg/92482486002.pdfIn PDF document text
    • http://foselosen.sportsontheweb.net/technical_project_manager_resume.pdfIn PDF document text
    • http://prostochillforum.fun/lurilu6po3y.pdfIn PDF document text
    • http://mihetos.xyz/54411341742fiqu2.pdfIn PDF document text
    • http://cafechorsu.ru/definicion_de_investigacion_educativau1br2.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/perfect_english_grammar_past_simple_past_perfect_exercises.pdfIn PDF document text
    • http://itverys.space/spellbound_korean_movie_eng_subg7smw.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/ronenitevodo/83854797103.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/2018_toyota_camry_leather_seat_covers.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/1438350795.pdfIn PDF document text
    • http://purevaxa.epizy.com/cracking_the_sat_with_5_practice_tests_2020_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/womegok.pdfIn PDF document text
    • http://jeputujakajaj.epizy.com/zalerefisamifaduvalapi.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_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 5636 bytes
SHA-256: 3a8780870f7fa0a149aaf044a2f56c6d983389f4b634f440d253caf2224ece63
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 11092 bytes
SHA-256: fb16ee1350b98769b7eccfd385bdf0c8665eab47456dd83ea471386fbcd8b12c

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