Malicious PDF — malware analysis report

Static analysis result for SHA-256 481e826b443d1838…

MALICIOUS

PDF

80.4 KB Created: 2021-02-11 18:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a691b7bdf84a983c4f2670da686f71d9 SHA-1: 95f1045db58d6b8a775b34133351edcfcb5a231c SHA-256: 481e826b443d183821d46dc7470d615423cd85821f1b15bf582d4fd6e47a271d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing or malware distribution vector. No scripts were extracted, but the structure and URL patterns are consistent with malicious document lures.

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://maypoin.ru/123?utm_term=maruna+summoners+war PDF link annotation
    • http://tikovg.xyz/napororefetukexamiiwo6o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_6024ac4ee533f.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/bHajiYg/phoenix_airport_car_rental_map.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479254/normal_5fcc1bef18235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387433/normal_5fc5b806e4458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_6012715f391a4.pdfIn PDF document text
    • http://ver-alex.website/bosco_verticale_floor_planswb9au.pdfIn PDF document text
    • http://chebsvet.ru/bond_energy_pogilgafgp.pdfIn PDF document text
    • http://supsun-aero.com/global_competitiveness_report_south_africahw2m9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_6018a47df1c63.pdfIn PDF document text
    • http://gogadozuxigode.iblogger.org/ace_of_wands_reversed_tarot_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452157/normal_5fda51353b70f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fipuxogililego.epizy.com/fawokaxozugavomizafezopup.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_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 4896 bytes
SHA-256: e88ee1ef49a4799cfdb186d7755c244ae76b67db2e70959b36e41b5231452ed1
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 10824 bytes
SHA-256: f0540f84d2ecac9e83a24828861f6840f6d9411a46f31cd7f1c5c0607a7ddf50
font_02_sfnt_off00011dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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