Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4687082bcbb5476…

MALICIOUS

PDF

69.3 KB Created: 2021-06-02 21:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e8b3ba090192907a7514e2e1c4c7cf9b SHA-1: b051f94762095ee1b678447afedfa68bafd10737 SHA-256: b4687082bcbb547616408f1b11557f5978c78d36878ae51fa19eef0963a54964
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 0.9993

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://huntic.ru/pbw?utm_term=a+level+maths+notes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380237/normal_60135d17871d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_60004f27d5e3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_601a48989545f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499656/normal_6001ed8889fa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_602d9c70813ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479921/normal_5fffea216af96.pdfIn PDF document text
    • https://fedonofawok.weebly.com/uploads/1/3/4/8/134881994/8beed5cc2c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_604b28da9a6e0.pdfIn PDF document text
    • https://pasuzexogisinib.weebly.com/uploads/1/3/4/2/134266431/68184760c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452193/normal_5fff55f3185a2.pdfIn PDF document text
    • https://ruxabetuju.weebly.com/uploads/1/3/2/7/132740595/c567b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fe82f9b78093.pdfIn PDF document text
    • https://xotituwidekave.weebly.com/uploads/1/3/4/5/134585458/9308405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499979/normal_604b96048d363.pdfIn PDF document text
    • https://norajaxufok.weebly.com/uploads/1/3/4/6/134611117/jigebigejesugos-tewujiposavuj-tezepa.pdfIn PDF document text
    • https://rodefakuwutepez.weebly.com/uploads/1/3/4/3/134341390/498379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426819/normal_5fcd26cb7530c.pdfIn PDF document text
    • https://xisigonok.weebly.com/uploads/1/3/4/7/134722575/9525814.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144443364/fawisixubed.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144488316/deezloader_remix_apk_ultima_version.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/dokufiwasevobizuziwukimeb.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/bully_anniversary_apk_data_200mb.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/f/sakopujitoxebonatode.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 5232 bytes
SHA-256: eb138db9c379bd4305e2d350c591c7310cc069cd67cc375f2d8bd81c9c6aa120
font_01_sfnt_off0000e443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 10576 bytes
SHA-256: 4f522a8f5845deb8aeea9fc6ba8c795bf9694f575416d11e0616d669fa259f77

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