Malicious PDF — malware analysis report

Static analysis result for SHA-256 94588d485aca84ea…

MALICIOUS

PDF

76.6 KB Created: 2021-03-09 00:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d9f751d53c4632e535b80e38fbef14e4 SHA-1: 2396763346ad85dbbec71db0f85cbe67748946b8 SHA-256: 94588d485aca84ea511853a442d27b9345fee26ed4a73cc80fd05a1a76a28c6d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/123?utm_term=abercrombie+and+fitch+size+guide+uk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fef377fbbd35.pdfIn PDF document text
    • https://vurutosefitipa.weebly.com/uploads/1/3/4/4/134479444/lilenopa.pdfIn PDF document text
    • http://lestyprin.online/aristotle_poetics_catharsisij8gc.pdfIn PDF document text
    • http://gusanod.22web.org/aksara_jawa_kuno.pdfIn PDF document text
    • https://bidelokezigakal.weebly.com/uploads/1/3/4/3/134342752/4676920.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/lutovu_zalesewajojemu_gelekena.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403948/normal_5ff5ede081e34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418755/normal_6046a426a0131.pdfIn PDF document text
    • http://palipupo.22web.org/9878982761.pdfIn PDF document text
    • https://motefeka.weebly.com/uploads/1/3/4/1/134108707/tututure-ridaji-jikam-noded.pdfIn PDF document text
    • http://leadtop.co/56458463399ic1cf.pdfIn PDF document text
    • http://academic-club.ru/kudetimazadawokitorexarem00fby.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujusitajal.rf.gd/anomaly_detection_machine_learning.pdfIn PDF document text
    • http://rikirusekufipu.epizy.com/zilexobozunivel.pdfIn PDF document text
    • http://gulesovel.epizy.com/i_ll_fly_away_sheet_music_satb.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/75946340055.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/sijirosot.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/bilirubin_metabolism_and_jaundice.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/swot_template_for_mac_pages.pdfIn PDF document text
    • http://vojusoligobaj.epizy.com/what_is_the_best_paper_shredder_to_buy_for_home_use.pdfIn PDF document text
    • http://fawepajemug.rf.gd/kadabivisukamutaranali.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/63312777757.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_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 5648 bytes
SHA-256: 74804cba487f368da1bf9359667ae8e16549e9733470775154c2c44496ae5d07
font_01_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 10872 bytes
SHA-256: aea37fe36ecb5c63cbdaf3e2ab01c1f959edd0c34cb1506b1b26fc07b32d0cb9

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