Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3bbda76f71b6a4…

MALICIOUS

PDF

77.0 KB Created: 2021-03-28 08:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ae1d1708f0d615eac4bb782882b2da9c SHA-1: af047ff1a244a53a3ed745d795d9509daa3410ef SHA-256: da3bbda76f71b6a4c55d37661d12a98b35ceb2e22e26cce81ab4a5eea507eee5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/award?keyword=lipid+metabolism+ppt+pdf PDF link annotation
    • http://usejus.pro/what_century_was_the_golden_ageenffh.pdfIn PDF document text
    • http://tawaguf.scienceontheweb.net/the_earth_chronicles_handbook_zecharia_sitchin.pdfIn PDF document text
    • http://crubr.space/tobovopudexomugzac2l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5fd9a31407394.pdfIn PDF document text
    • http://paxibokojusaduw.22web.org/68646350823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482020/normal_5ff715b2900db.pdfIn PDF document text
    • http://itmax.info/avatar_kyoshi_booka1lcy.pdfIn PDF document text
    • https://cdn.sqhk.co/zaletimerizo/gcQXiiM/block_strike_online.pdfIn PDF document text
    • http://montana-media.com/venn_diagram_3_circles_problems_with_answers51c49.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/icSgdhe/trial_xtreme_4.pdfIn PDF document text
    • http://gizaxeredemuni.22web.org/migowijutusofefade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426558/normal_5ffc6479bca32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388820/normal_5fda3bee1ce6e.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/principles_of_helicopter_aerodynamics_free_download.pdfIn PDF document text
    • http://dusipoweg.mywebcommunity.org/screening_of_antidiabetic_drugs.pdfIn PDF document text
    • http://betifogolejom.iblogger.org/aws_certified_solutions_architect_professional_study_guide.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/how_to_write_a_brief_summary_about_yourself_for_a_job6kou6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujasisu.epizy.com/dreams_from_my_father_obama.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/gregorian_julian_calendar_conversion.pdfIn PDF document text
    • http://fegoluvarelewum.myartsonline.com/muwinuniteriruru.pdfIn PDF document text
    • http://rexonaboruli.epizy.com/fupemewenutij.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_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 5172 bytes
SHA-256: fb6d9b645244976b8c182edd40b2e51a1c5ec475498772f072a5170cd8a0c64c
font_01_sfnt_off000101cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 10796 bytes
SHA-256: 5e67666e35172368bd51f08c35330c1ed8e8cd6348e490e8dc74904c0d64cf23

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