Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e791611074ca0b…

MALICIOUS

PDF

101.3 KB Created: 2021-03-20 22:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f89ae52c6272b2ba23c77251f92c89c3 SHA-1: 093f25a182c3649b8769ccf72e8f2ed4dc05fe42 SHA-256: 38e791611074ca0bb31b75aec105f63897786ff7da964799520ce0dc747f24db
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://ponafet.ru/award?keyword=ceremony+leslie+marmon+silko+pdf PDF link annotation
    • https://cdn.sqhk.co/fuvivemu/lAhcCGc/big_bang_theory_cast_earnings.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/fhbijje/99780312571.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/oihgijd/top_25_switch_rpgs.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/gcgUOge/33094901336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_5fce4cd3f2df7.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/gcnTfig/61836102813.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/jgjii2l/screen_recorder_free_windows_10_no_watermark.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_602b791c4ce1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464080/normal_600ab6500d179.pdfIn PDF document text
    • http://moymagazin.xyz/music_appreciation_textbook25vaz.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/apFTSnM/37375018784.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/10717480669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410000/normal_6055f39529bd0.pdfIn PDF document text
    • http://womuvizitina.mywebcommunity.org/2673846364.pdfIn PDF document text
    • http://insurancesouk.com/definition_text_structurewonk9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gapivegek/45391950806.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/51355369986.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/gujebo.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/external_style_sheet_in_css3.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_off00014fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC9 5256 bytes
SHA-256: 4b94d12f5a2f2060ee16af9850e64c421094277d930beaa331492e5096406462
font_01_sfnt_off0001619b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1619B 11540 bytes
SHA-256: bd10bbbe5b700e45e34eee180ec6f41eea18b13167699d9fcc53bd8f2b910c99

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