Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf18a56400fff50…

MALICIOUS

PDF

75.1 KB Created: 2021-06-10 05:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2924ef2d3cda296a75555360f47b7b34 SHA-1: 1cdd9145e1deb555f609ebcd058b97dba3080ffa SHA-256: caf18a56400fff50ccc7fbfc300e6b96a3f2c614ec969745385639950de033bb
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://pixomot.ru/pbw?utm_term=best+phone+ringtone+mp3+download PDF link annotation
    • https://runogobikekeg.weebly.com/uploads/1/3/5/3/135350887/5941660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_60553496a96c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424376/normal_5ff50f42417be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381539/normal_5fc5bb19c12ef.pdfIn PDF document text
    • https://nilorajokurede.weebly.com/uploads/1/3/4/6/134626806/mapolilezeru_lananoraguwo_gemifajugenog.pdfIn PDF document text
    • https://benowanazopawa.weebly.com/uploads/1/3/0/7/130740092/liline-ragakaserimolu-nudezomonajuxef.pdfIn PDF document text
    • https://gizibufunete.weebly.com/uploads/1/3/4/4/134492386/fd5e057.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funesut.pbworks.com/f/adobe_premiere_pro_cc_2020_crack_reddit.pdfIn PDF document text
    • http://maxasol.pbworks.com/f/modifying_comparatives_and_superlatives_exercises_c1.pdfIn PDF document text
    • http://dipazuwawex.pbworks.com/f/solving_using_the_quadratic_formula_worksheet_math_154b.pdfIn PDF document text
    • http://dumogaluz.pbworks.com/f/suicide_squad_full_movie_download_in_hindi_480p_filmyzilla.pdfIn PDF document text
    • http://sapixesut.pbworks.com/f/download_emergency_call_112.pdfIn PDF document text
    • http://namikikis.pbworks.com/f/xejix.pdfIn PDF document text
    • http://malamojozag.pbworks.com/w/file/fetch/144518985/best_career_aptitude_tests.pdfIn PDF document text
    • http://duvetemeb.pbworks.com/w/file/fetch/144973545/88280684069.pdfIn PDF document text
    • http://pajajafilexe.pbworks.com/f/gawil.pdfIn PDF document text
    • http://magogopowo.pbworks.com/w/file/fetch/144993174/tutojijuguxebazuzodivepir.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144412116/how_to_identify_herpes_zoster.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144466179/can_you_wash_pack_n_play_bassinet.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_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 5676 bytes
SHA-256: a999fa9b9aee4773a5fc840514f1834dceca55f781bdedbf3f6401ce396f271e
font_01_sfnt_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 10904 bytes
SHA-256: 8f902d44fe3e66cc03f9f3d7f3f3dd16dbd553ef33705490b29a38b5822e53a7

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