Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d45ce0b12bde90…

MALICIOUS

PDF

85.0 KB Created: 2021-03-22 06:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 855f576f058cc12c2c357efc9596f567 SHA-1: a993ec398d62df5607208d225f1456ffab8f6e54 SHA-256: 85d45ce0b12bde90485026c0f6e26cb7b4aaa5c2b96cc03a637184bd78dcb516
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 0.9961

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://dafemum.ru/award?keyword=aptitude+test+for+school+beginners+pdf PDF link annotation
    • http://govnosiakxws.online/how_much_oil_to_put_in_ariens_snowblower5fbt9.pdfIn PDF document text
    • http://tryse.xyz/voluzujagamoxekago8dz5n.pdfIn PDF document text
    • https://cdn.sqhk.co/rudixika/iicviiu/goat_simulator_waste_of_space_all_trophies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464056/normal_60209061122d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_6042dd462b15d.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/hhRUigV/konewotara.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/ijJibhe/imfao_meaning_in_bengali.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/cClihhg/radio_italia_live_milano_cantanti.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/b5eUXjc/82527840169.pdfIn PDF document text
    • http://wonnaturila.space/christmas_music_instrumental62mwf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_60395aea67e6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423714/normal_5fe4add7bce2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389606/normal_5fc6afd75df94.pdfIn PDF document text
    • http://katermore.ru/honda_hs928_service_manualibfe5.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/zikeko/cultivo_de_arandanos_peru.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_3cbb4b4ac0ee4be28e1b973d9787fa7b.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_b1b82b8d32854963b532e8b0557ef8d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/phonetic_alphabet_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/jixunu.pdfIn PDF document text
    • https://1437f3f1-f978-4e1b-9120-555090070881.filesusr.com/ugd/d4ef56_7239b7084f4145e7be94e8b0137ed798.pdf?index=trueIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_9cea7aab0b7945dba0bb4772dc52ced8.pdf?index=trueIn PDF document text
    • https://78f5967e-1348-44d0-b43d-4fba71d4c3e7.filesusr.com/ugd/a94f6a_9beebb10189e48e0a1331f660f1735f8.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_1aa6eb881d0d4c55accb97c42d44e777.pdf?index=trueIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_46e6fa25869d4155a1c54e66693e359f.pdf?index=trueIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_8e4df6b718a34b3592058ecb6229ba93.pdf?index=trueIn PDF document text
    • https://2770fe0e-c746-4c0f-8f0e-e6ef6e211e89.filesusr.com/ugd/be19e1_35003fcec6be4d4984295768c1688300.pdf?index=trueIn 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_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 5336 bytes
SHA-256: 2058e241141ddb63e2e4c0b36f3655d9121ad8a48b3e67ccf021e05ee12d63a3
font_01_sfnt_off00011fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 10900 bytes
SHA-256: 0aca851694a53e12dda8f8c0ceddfdfbd1c36a97294707680a2f0a59bd5e5fe7

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