Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0fa3e0a0d35294…

MALICIOUS

PDF

75.7 KB Created: 2021-04-12 18:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9080a21f74845a0c396092660d4fcb2d SHA-1: 5976f17ad906485476aa263d542e655931344e04 SHA-256: bd0fa3e0a0d3529486f66fb0ab4d84768aaea521b213dbc43a207e963abf8e5b
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 0.9996

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://golowaki.ru/strik?utm_term=tecumseh+6.5+hp+engine+upgrades PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378160/normal_6022605aea1f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380210/normal_5fe2b4336e0a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420245/normal_5fc83c9cd1b79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450242/normal_6037ae4ded394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_601a24de753cd.pdfIn PDF document text
    • http://nesobaka7.xyz/87831515740r2twq.pdfIn PDF document text
    • http://mazipuvaxa.mywebcommunity.org/62642506365.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/apache_spark_with_python.pdfIn PDF document text
    • http://onlinetiser.website/nosazefazonosupogafumr6wp.pdfIn PDF document text
    • http://xopijodujakik.22web.org/nice_guidelines_hypertensive_urgency.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4da44922-6ee1-4515-aed7-54c3d6b51f77.filesusr.com/ugd/243a28_c46cd9e019904739b5c080aa50bae4ed.pdf?index=trueIn PDF document text
    • http://murorutikuba.rf.gd/basic_computer_notes_in_marathi.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_95593a29021a4b36bf782ab2f123fa61.pdf?index=trueIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/the_uses_of_enchantment_bettelheim.pdfIn PDF document text
    • http://poxujub.rf.gd/nabomon.pdfIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_76c7046007e5434a876d6010c6ac60ef.pdf?index=trueIn PDF document text
    • http://kugunimekuxaf.epizy.com/puwiwuvedixis.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/best_waffle_maker_to_buy_in_india.pdfIn PDF document text
    • http://kafopazam.epizy.com/apptoko_traffic_rider_mod_apk.pdfIn PDF document text
    • http://nivewuwasidurus.epizy.com/67329987996.pdfIn PDF document text
    • http://nelifudo.epizy.com/complete_key_for_schools_with_answers.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_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 5716 bytes
SHA-256: 543d7ef21e54326541fb1373879f4110d0b4e750940df6b07afac7c4ac6692be
font_01_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 10856 bytes
SHA-256: d5ea9192dd0be9aa63642fd64d49935eb028ffaa6fa5b91f13ec602ab1ed0c68

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