Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d631b5f8668664…

MALICIOUS

PDF

81.5 KB Created: 2021-02-27 08:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ff3bba199fae95b8d34c09895a6671d4 SHA-1: ca3980a88273b8a79a0014add1ca6efcc100d3c9 SHA-256: d6d631b5f86686648fb6046a850d1c3d392b580db7904ebdc55f6cc6b4416b40
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://druttle.ru/aws?utm_term=does+fender+tone+work+with+lt25 PDF link annotation
    • http://pufivuziviv.mypressonline.com/sukarimubidolize.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/mcculloch_string_trimmer_parts.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/when_did_bc_and_ad_become_bce_and_ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_6033a26b100c3.pdfIn PDF document text
    • http://phrensy.co/venawugemvfcsj.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/roluniwimazizo.pdfIn PDF document text
    • http://penageli.getenjoyment.net/metamorphoses_book_14_sparknotes.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/mudinoripagoduta.pdfIn PDF document text
    • http://bigno.space/simplifying_radicals_worksheet_keydb1fx.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/can_human_live_more_than_200_years.pdfIn PDF document text
    • http://kpovli.ru/danganronpa_episode_3_google_drive8is66.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/zivozumanogokimeti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sidepojedava.myartsonline.com/gowegoximevedutujisa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 4984 bytes
SHA-256: 113febdc139f48fc2ca5c4dae3460744daa1a2aa1dd1df374c27008d2b97aff4
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 11460 bytes
SHA-256: 80295d75e6b82bd15cebfc1ddcf450224e2b2b0dff060af69d0087ba4fae7820
font_02_sfnt_off000128ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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