Malicious PDF — malware analysis report

Static analysis result for SHA-256 813acf3d13346e1a…

MALICIOUS

PDF

100.8 KB Created: 2021-03-25 13:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e61b7ae0cd83c146976de3ccc7373b9d SHA-1: a8e39703ef85a1f4e10642840a53bfad3534e72b SHA-256: 813acf3d13346e1ac9c26596b2f74642349e690773a649b54abb40b9a2c6d498
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 0.9998

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://nipisod.ru/wix?keyword=assassin%2527s+creed+unity+game+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488332/normal_5fd1c2fe095ae.pdfIn PDF document text
    • http://vatemuredaxusob.22web.org/85047375911.pdfIn PDF document text
    • https://cdn.sqhk.co/bodevoposuji/iLA7hcR/warriors_of_genesis_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/EeWaSje/70827566245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503692/normal_604ca5e2bb469.pdfIn PDF document text
    • http://tonukavugu.mygamesonline.org/buku_anis_matta.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/CIiiigh/zombie_haters_mod_apk_unlimited_money.pdfIn PDF document text
    • http://tekelas.iblogger.org/wupozopelo.pdfIn PDF document text
    • http://megopoveguvujal.medianewsonline.com/budesonida_presentacion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504870/normal_60278f7223c1d.pdfIn PDF document text
    • https://cdn.sqhk.co/rirelolut/q9hgcjg/modefupawova.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/0xKigSx/fipode.pdfIn PDF document text
    • http://sikukeze.22web.org/spelling_bee_rules.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://suginuzebaluwom.rf.gd/rajenus.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/autocad_2018_to_dwg_conversion.pdfIn PDF document text
    • http://gomitobovuni.rf.gd/roziranigubagegegakek.pdfIn PDF document text
    • http://telewazikenap.rf.gd/56147658996.pdfIn PDF document text
    • http://minivenema.atwebpages.com/34748007466.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_off0001408d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408D 5124 bytes
SHA-256: 1b65a3ef87eb68818ccece805fc4b9d00fe68a077f4cad7c9798207bf6e82337
font_01_sfnt_off000151e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E0 11052 bytes
SHA-256: 17ab9091977b2854f9cd1e54a3a618a3877f6e878dfa483f5228b5466d80bdd6
font_02_sfnt_off00017788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17788 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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