Malicious PDF — malware analysis report

Static analysis result for SHA-256 12381815709b1a7b…

MALICIOUS

PDF

81.8 KB Created: 2021-03-28 06:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 35458f77dfcf52fe6b29f0d4160e2ae3 SHA-1: 1beb5173ecfc7ca098d63f10eeb039585f1f636d SHA-256: 12381815709b1a7b67f2e3933d9201e9f08e827f69898b761f99dbfb2fd548a2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=duracell+battery+charger+and+maintainer+vs+battery+tender PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418972/normal_60499e06ba8cc.pdfIn PDF document text
    • https://lorivomewojesab.weebly.com/uploads/1/3/0/8/130813497/lafubunelan-tibogaxi.pdfIn PDF document text
    • http://zavutuwifuwe.iblogger.org/archaeology_book.pdfIn PDF document text
    • http://vikidavilor.22web.org/binder_cover_sheet_template_word.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470678/normal_5feea94f14912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_6029a2a52fb22.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/jozimiwugivulev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_e20df5931e2a46e8a0bccaad21303395.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_c8c01109f0434fcbbc48413b3301923e.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_670340858e844083a9c9905b5cc3683e.pdf?index=trueIn PDF document text
    • http://filikenogax.epizy.com/how_long_was_the_hobbit_book.pdfIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_7e073a3865344277afb19c2ee2e9b346.pdf?index=trueIn PDF document text
    • http://dunasiru.rf.gd/vimivofiwarovukajikaba.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_d9ffbdeab64f4ab8a6984a3fbfd64b2f.pdf?index=trueIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_5edd11de3f2a4c0cacf3dac16491148a.pdf?index=trueIn PDF document text
    • http://lomonejezatixow.rf.gd/how_to_change_oil_in_a_lawn_mower_craftsman.pdfIn PDF document text
    • http://vixabewe.rf.gd/bowesilekafiseribedove.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_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 5656 bytes
SHA-256: 6860da8468ba2894d0e71d4ef3d80edb3d9ae84c586e6a0206e1d6f455fedcd6
font_01_sfnt_off0001140f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140F 11004 bytes
SHA-256: dcd68ac81f1e2350354dee639839f3f11635f9529ae1ccad9d20f7452bf26523

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