Malicious PDF — malware analysis report

Static analysis result for SHA-256 344bcbbb3dd272da…

MALICIOUS

PDF

85.8 KB Created: 2021-03-11 06:49:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b07520ea71f90cbf3b1ee4f62b6e8deb SHA-1: c4d937ae1e9a4d04154b0f256b2f4bca6856c167 SHA-256: 344bcbbb3dd272da0c946194397763882349f3718fe32c097097a597e82464b9
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 is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or malware distribution by redirecting users to external sites. The presence of embedded URLs suggests an attempt to direct users to malicious content.

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://jumiwimov.ru/strik?utm_term=charla+de+seguridad+orden+y+limpieza+ppt PDF link annotation
    • http://rofuxipof.mywebcommunity.org/bubedozefadusipikokitu.pdfIn PDF document text
    • https://cdn.sqhk.co/bamopilu/ar7hbhc/23618801930.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/ap_art_concentration_ideas.pdfIn PDF document text
    • http://vbnmcxz.xyz/35679380751umr6b.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/how_do_you_calculate_military_medical_retirement_pay.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/brother_hl-2270dw_printer_toner_reset.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/86614541072.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/ansiedad_scielo.pdfIn PDF document text
    • http://luchdobro.site/tolazede2xfd.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/hi4K3Jy/95900911620.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/jiaOwgc/30703881642.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/grade_8_math_worksheets.pdfIn PDF document text
    • http://desokore.medianewsonline.com/12724119534.pdfIn PDF document text
    • http://fruitik.space/harsh_mohan_textbook_of_pathology_8th_editionp6gbl.pdfIn PDF document text
    • http://legalvictory.group/red_pyramid_audiobook920y6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tulajadulixo.myartsonline.com/ragarasozapewanemato.pdfIn PDF document text
    • http://nabulegewuwal.myartsonline.com/77640843399.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/tin_tin_dog_star_from_old_movies.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 5432 bytes
SHA-256: 2bfc9cfe22bf276054d2e3ae95c105d164c3a428efadf5fc4a81872fd1afb7cf
font_01_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 11876 bytes
SHA-256: 26b1dfa548c987d82cf4c5611c216d859ea75f33a83e2fb21fc35f1ae5c8056f
font_02_sfnt_off00013a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A25 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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