Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec0f5a76617436c…

MALICIOUS

PDF

70.9 KB Created: 2021-01-31 21:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 644d81dbbd7071155b1dd1bb484656ab SHA-1: 7892b52fe55006cdea41bfd032ac9c96ca75ad0e SHA-256: eec0f5a76617436c598fc780f36af43c2398c1eab98825dd30bcd8253f8b936a
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary one pointing to 'druttle.ru', disguised as a link to a movie. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detection confirms it as a phishing/trojan PDF. The ML classifier also strongly flagged it as malicious. The presence of external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=the+spectacular+now+watch+online+with+english+subtitles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494417/normal_5fd9c6cc88762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5fdac79724656.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/UhajeCJ/68257477632.pdfIn PDF document text
    • https://cdn.sqhk.co/bureruverog/azNjfif/besuwikexugetuligorona.pdfIn PDF document text
    • http://sijowusim.22web.org/kekanupopezikaxusazudit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418192/normal_6015867caf705.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470408/normal_5fcda55316970.pdfIn PDF document text
    • http://glawerry.online/assassination_techniquesaucak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382418/normal_5fdf2a1fcda69.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/hjhhzie/viruses_are_living_argument.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427544/normal_5ff6749020a8e.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/t4Zjajj/cake_decorator_jobs_salary.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/tarizirefevifab/bichhoo_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/44832471355.pdfIn PDF document text
    • http://tekunobujolid.epizy.com/ofac_countries_list_2017.pdfIn PDF document text
    • http://xubaforan.epizy.com/bms_medical_course_full_form.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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 5376 bytes
SHA-256: 18a7787b5f125c3cee1bb683fbd6b4fd55ce2438e089043de0025454ad0a2c18
font_01_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 10508 bytes
SHA-256: 96134b3bedcb0138a2705053e85fef4344cc1f3ec3fdda3a79b0541f0ccb2bfd

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