Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f8769eecbba1a0…

MALICIOUS

PDF

73.8 KB Created: 2021-06-02 16:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 31294a4fe30f6828ab467ee907ba0181 SHA-1: 53aa0e40de0c37cc69f4d33db2a6ad511437663f SHA-256: 75f8769eecbba1a0ebc0004a845c1b722c1814fcccd96f95b1acf6431fb17519
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://infrive.ru/pbw?utm_term=plano+de+leitura+da+b%25C3%25ADblia+em+1+ano+para+imprimir PDF link annotation
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/4d171ae76d40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486053/normal_5ff498fad7633.pdfIn PDF document text
    • https://pasuzexogisinib.weebly.com/uploads/1/3/4/2/134266431/gebuvowenujiforufulo.pdfIn PDF document text
    • https://vomifiwuf.weebly.com/uploads/1/3/4/8/134870299/samuvupoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481420/normal_6052c86c755e6.pdfIn PDF document text
    • https://jitaginedisa.weebly.com/uploads/1/3/4/3/134324559/wejaz-fumem-dorejirin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_5ff52a1a1d5ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_600cc3622aae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408001/normal_6039b6fd8aedd.pdfIn PDF document text
    • https://dibuponabax.weebly.com/uploads/1/3/4/3/134340508/5940253.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bc5634-892a-44e4-a436-05eadb291750/1385668222.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/f/gentle_c-section_birth_plan_template.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144421494/descargar_cantos_del_camino_neocatecumenal_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59185ddf-a479-44f5-82c8-4f55a0858873/jusafozizogugokedaxasop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146d57fc-ce84-4153-9658-2131eb23c318/73978693738.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/w/file/fetch/144480777/48734291227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d59d6870-1820-42f3-b48a-9c021e6ff347/banekenumaj.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/27487568880.pdfIn PDF document text
    • http://pevozowo.pbworks.com/f/35460256916.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/f/38921879836.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_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 5172 bytes
SHA-256: e45926c3e1e042afb3c53d45edb5643399a89c2865e478238f6b0aa005dd697d
font_01_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 12820 bytes
SHA-256: da453fa68ecd576460691cc1cf969972cce3f2cd2f38b7b3dc870bd51cb9c07b

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