Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b03530ccd040a5…

MALICIOUS

PDF

78.4 KB Created: 2021-02-25 07:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1bcf24e0d7d8cddcf3609b0fd8126510 SHA-1: 968c1e8390786ff30ef29c0028f880dc6417ac2a SHA-256: 85b03530ccd040a5c9da52e4df8a3caece81e7cd30247b3a926c56a1ca1c829f
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrustworthy hosting, reinforcing the phishing or malware distribution intent.

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://jottigo.ru/123?utm_term=reacciones+de+combustion+incompleta+ejemplos PDF link annotation
    • http://leninuludobodu.mygamesonline.org/schwinn_270_recumbent_bike_console_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/tamenotu/Tjd7jfb/lefojeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_601f59b1121a1.pdfIn PDF document text
    • http://timogefubor.22web.org/59407475565.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/gjgfzZk/alien_mission_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_602d8bbca51fe.pdfIn PDF document text
    • https://cdn.sqhk.co/tirewaku/5gijghh/todo_list_app.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/jovujazulopazinolotunuje.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/hadji_murad_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/1RJkmic/schema_electrique_froid_industriel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_5fd8b49114d6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367914/normal_5fcff4444ee06.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
    • https://s3.amazonaws.com/ponivotigegepub/79079173325.pdfIn PDF document text
    • http://mitefarosut.rf.gd/ride_the_tiger_evola.pdfIn PDF document text
    • http://xakitidopapav.epizy.com/jabilekiliguweron.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/69051513255.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/jsc_arcelormittal_temirtau_company_information.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/90761679907.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_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 5228 bytes
SHA-256: 0d722f026d04c4968a512184baf029c6a88570c879a5fc39f159a02b1d73975d
font_01_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 11600 bytes
SHA-256: 2c3054203c97df0c4221d2264fdc09cad23d969af13e4fb43326d350c7a5cdfb
font_02_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

Open this report in the interactive analyzer, or submit your own file for analysis.