Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf0594b68e17ec6…

MALICIOUS

PDF

79.1 KB Created: 2021-03-31 02:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b6742386526b8780ca04f229e948ef77 SHA-1: 19a379dc7d00c06c0b654e83fa12c7b6c06b489a SHA-256: 5bf0594b68e17ec663cf9cccf9e1f6703790ce9773d52cd3765849009c2a4ed5
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://gimoguvi.ru/strik?utm_term=batman+the+dark+knight+returns+part+3+animated PDF link annotation
    • http://sozaxesugoj.mywebcommunity.org/vinanigavotaniref.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_602eaaa92ac82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499656/normal_60116dd815a6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476782/normal_604851d27bbff.pdfIn PDF document text
    • http://xebiniseba.mygamesonline.org/83837402273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447252/normal_604f3976af0ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_602c06bd82db9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444369/normal_602932701e022.pdfIn PDF document text
    • http://vatetuda.scienceontheweb.net/xitegobekod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_60157ea50d018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478408/normal_6063a6373d560.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/static_gk_for_rrb_po_mains_2020.pdfIn PDF document text
    • http://wuxetij.mypressonline.com/80787077908.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/animorphs_the_invasion.pdfIn PDF document text
    • http://padojobimo.mywebcommunity.org/movinerarilitibomaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_602c0da833152.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jubewezevo.rf.gd/romeo_and_juliet_character_quotes.pdfIn PDF document text
    • http://fukijudetoj.epizy.com/how_to_type_greek_letters_on_english_keyboard.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/baror.pdfIn PDF document text
    • http://gugujis.epizy.com/bufewegibobekug.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/what_is_mgsv_definitive_edition.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_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 5620 bytes
SHA-256: 340f87b56a95b8511f69e346dbe8a5d5dd0b7a0fdc47569df6beb79403ca1478
font_01_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 12556 bytes
SHA-256: 1be4709e04ba5c913154189846105cb8f0d4417197145f6de37d9e4fd2e002e0

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