Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd63e66aa72b53d5…

MALICIOUS

PDF

90.5 KB Created: 2021-03-04 03:48:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b6ecc5a34df85418f84596e945beef46 SHA-1: f8075b2af6e3b3ab7f8d3cd08ddfeac81c47081a SHA-256: fd63e66aa72b53d588932cd51d3637f366451cd613804d9d45264c5120b08841
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, with one prominent URL suggesting a lure related to job interviews and fast food. The presence of external URIs and link farm heuristics further supports the malicious intent of distributing or redirecting 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://zajinet.ru/123?utm_term=what+to+bring+to+an+interview+teenager+fast+food PDF link annotation
    • http://shtangye.xyz/oscar_health_tempef2kha.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/e8rVQhi/83980514565.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/ajTVAb1/kisegovavifaxupal.pdfIn PDF document text
    • http://sdek-24.cc/windwalker_monk_pvp_talent_guidea0bvm.pdfIn PDF document text
    • https://cdn.sqhk.co/gilikomow/igifihk/color_road_icon_aesthetic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409604/normal_5ffff00c9019f.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/Uhe2Ejg/wrecked_island_survival_sim_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407327/normal_5ff01833dd70c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413468/normal_5ff41f6d1618d.pdfIn PDF document text
    • http://verification-help.com/intermediate_botany_practical_manualuj5wc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_602385e0db9f0.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/my_family_and_other_animals_movie_2005.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/zotumuvir.pdfIn PDF document text
    • http://setowibuvi.epizy.com/4255376795.pdfIn PDF document text
    • http://xobeminal.atwebpages.com/ilo_tv_brand_name.pdfIn PDF document text
    • http://kunovudulex.rf.gd/bts_boy_with_luv_mv_video.pdfIn PDF document text
    • http://nelivizazepafo.epizy.com/kedobe.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/17457259946.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_off00012578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12578 5444 bytes
SHA-256: 2757f3c32412e37aefb95b165dd6ead98cdabc576312eeb4d352e3ace2c72765
font_01_sfnt_off00013810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13810 10924 bytes
SHA-256: ea7fafdcce1fff16d8299611787985aaeb13086ec9ec325c12d0d1b21a739fe3

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