Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf33e4ba3e4270cc…

MALICIOUS

PDF

68.8 KB Created: 2021-03-27 21:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c07c73c89d2e6d20fed1cbe1c0b6d864 SHA-1: 720cd3cd86caa100e5ce84b4db34ec5183c515e4 SHA-256: bf33e4ba3e4270cca70aebce3c85dae2ebc93f252f3662bce101b333c04f3282
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://resalured.ru/123?utm_term=aluminium+oxide+material+safety+data+sheet PDF link annotation
    • https://cdn.sqhk.co/xovujiroveg/tgjiaig/brave_frontier_heroes_of_a_new_era.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/8899720762s19sr.pdfIn PDF document text
    • http://pametuwujikedag.iblogger.org/watutumukul.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/bO56gdv/mastermind_game_show_zambia.pdfIn PDF document text
    • http://extraterrestrials.space/loxelosesedozurlyjp.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/g2hdjc5/98214541565.pdfIn PDF document text
    • http://wapajag.22web.org/index_of_civil_engineering_books.pdfIn PDF document text
    • http://best-ital.fun/musufovemuwuljby46.pdfIn PDF document text
    • http://supexevibune.22web.org/epictetus_enchiridion_translations.pdfIn PDF document text
    • https://cdn.sqhk.co/nexapebevux/jergcib/tokilifanapolidupumuf.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/jifjhia/dead_zed_unblocked_77.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/6506173b-bdc9-49cd-b1c9-daea371dac5d/bupijerijabiwozifovos.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/63402248952.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/every_mans_battle_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc26984e-d309-47d6-b182-09037d890acc/tafunutidirusu.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/blackberry_10_os_whatsapp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2344106c-9a0e-4ce8-897e-acfb9f619a63/wafunuzusegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75739ec-1607-4456-9146-f51e03cfdf58/64346641299.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/sateditigugiwudesagaveful.pdfIn PDF document text
    • http://jiminoxesovibin.epizy.com/59118344180.pdfIn PDF document text
    • http://vedaremix.epizy.com/butterball_electric_turkey_fryer_instructions.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_off0000cf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF57 5308 bytes
SHA-256: a6fe826cd44cee79f94fe4e2382c236fb4496f07cf17ee888e7ed116da23e525
font_01_sfnt_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 10772 bytes
SHA-256: dd9d778eb8bdf97acbca013ae40bef96faf15537bb020e8e21131e8b02df6b86

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