Malicious PDF — malware analysis report

Static analysis result for SHA-256 4870277fa3a404c6…

MALICIOUS

PDF

75.3 KB Created: 2021-02-10 22:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 40cb5a3fb04827daef58ae9278af2fb8 SHA-1: 080a51407849ea2e3a0c24487f0571009ad6facb SHA-256: 4870277fa3a404c66e8edbf9bb62d22c0fca7c451de9b247423df3620ca12914
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

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://druttle.ru/123?utm_term=diving+board+in+spanish PDF link annotation
    • http://alexandreablog.com/10_avatars_of_lord_vishnu_in_teluguszg6k.pdfIn PDF document text
    • http://rusakova.space/pathfinder_sleeping_in_armorx0ll1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501989/normal_5fd787f2039cd.pdfIn PDF document text
    • http://pshcomonhere.xyz/daraz_apk_for_android_4._1._2jdnht.pdfIn PDF document text
    • http://kawlites.online/cosmopolitan_las_vegas_hotel_booking0rtlr.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/nuwuwetotiibp61.pdfIn PDF document text
    • http://sellforce.ru/zefasiletobexuwinataliqg1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484355/normal_60118bd5ec207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380413/normal_60086bd4861fb.pdfIn PDF document text
    • https://petenugilamabo.weebly.com/uploads/1/3/1/4/131453278/2581449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_5fd5f2dc4242f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421767/normal_601de1cf3804d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416299/normal_5fc66a956eda2.pdfIn PDF document text
    • http://purpless.vip/blocky_farm_racing_and_simulator_mod_apk_download6gheb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421215/normal_600c92559cd5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_60175ec11b07b.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/medaliwifufugel/1574745861.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/devegizutunu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 5388 bytes
SHA-256: 937efd9f6023aee0f41b81bdf29e878a2786568b41eccfc6be6388e26be7d98c
font_01_sfnt_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 11864 bytes
SHA-256: 39d67bb8b69239aac40a89c6c1e0e55f2973dccf2faa6e05aa09a873ebd0bf5b
font_02_sfnt_off00010b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 16068 bytes
SHA-256: 1f10eee925fbe99070ce930aad2781db9cd53dceef6a88ee5d5c61933f6ad089

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