Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ea31a1712762d6…

MALICIOUS

PDF

72.1 KB Created: 2021-06-04 21:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c1ae361e2d82ff78c9633512547d709e SHA-1: 84f285665579b819e4ffbb47656eafad4744e4a7 SHA-256: 43ea31a1712762d6276d39884cd17e886a928da0deb8822fa373b0ca4f020b3a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/pbw?utm_term=grammar+monster+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487424/normal_606e45d11e7f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456996/normal_5fe36e907f0bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420934/normal_60055e7bb103d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4465250/normal_60b6a3dea5363.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450517/normal_5fc71a9487987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_606b6ba81bf1a.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/fb23dbe3-f1b3-4ab6-97ab-f916da3936da/65001144157.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/f/gepekumagijon.pdfIn PDF document text
    • http://sewafebi.pbworks.com/w/file/fetch/144424266/22570176222.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144416886/23364756158.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144419112/rilaz.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144558084/crack_auto-tune_evo_vst_pc_v6.09.pdfIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144477906/jeniwix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df8ab87-bf6a-487c-bc93-6b8a1604610d/pigixadukirugutat.pdfIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/144549729/starting_out_with_java_from_control_structures_through_objects.pdfIn PDF document text
    • http://magogopowo.pbworks.com/w/file/fetch/144475743/19736250900.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/ejemplos_de_frases_para_promocionar_un_producto.pdfIn PDF document text
    • http://gudotoxej.pbworks.com/w/file/fetch/144514050/present_simple_and_continuous_reading_text.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_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 5388 bytes
SHA-256: e7c381b89c89350b6fec7eb27cba4319c3a403bb1ebe31bd528965e49344ceba
font_01_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 10232 bytes
SHA-256: f2704b161f6cd10464196d9623990d44dd32066ded5c162aa5bb5ae41fa39424

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