Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eff1e014111b30…

MALICIOUS

PDF

77.1 KB Created: 2021-03-21 11:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 40570c4c7cafe281522db3b2c54510d0 SHA-1: 1c2738540d9e61e591d6d455b276900ed3f44e99 SHA-256: 88eff1e014111b302b2adc78430cc3340501bab5c2547ef4b5fbff876af24439
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://baarspo.ru/strik?utm_term=how+to+use+chef%2527s+choice+knife+sharpener+310 PDF link annotation
    • http://superheatbelt.xyz/overcoming_barriers_to_change9r3mj.pdfIn PDF document text
    • http://amandeepsadyora.com/dragalia_lost_dps_sim_2._0v6brb.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/aoxlDjg/dream_winner_soccer_2020_mod.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/vasokd6ayr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_602960d8175d1.pdfIn PDF document text
    • https://cdn.sqhk.co/xumobopore/Ohfz7he/gladiator_rising_2_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5fd646dc4c35c.pdfIn PDF document text
    • https://cdn.sqhk.co/lamikolo/heQz7jh/rotevebenafikonevib.pdfIn PDF document text
    • http://difipalilif.scienceontheweb.net/how_to_find_old_judge_mathis_episodes.pdfIn PDF document text
    • http://ourfanz.com/temalifegiklnxg2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_602e0420d54d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383446/normal_6003db9f09806.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nejarisiwudu.atwebpages.com/angle_worksheets_grade_4_free.pdfIn PDF document text
    • http://gemawinikifiv.myartsonline.com/biochemistry_mbbs_practical_viva_questions.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_920b03d163784d29b8d38727ca5db6f9.pdf?index=trueIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_227f4b5860874c0f868aad5e6fc2baa4.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_a88a3df653174258ae5ef4e16b5767c4.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_3ef98a8359a5421b994aba52b2eeb027.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_0948ac4283444afbab4b711c8af42b0b.pdf?index=trueIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_a55aec79745147bdb8433e15a5a97a65.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_8ca36b743d1a4755928e13056e3f4fb4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 5464 bytes
SHA-256: 83e3ac13c6070447eca80f01c6f4256880c8e64bf567c311c61454e7d417e403
font_01_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 9808 bytes
SHA-256: 0a1a5bd372b86ad3f82013bb9238180db767f58e356bcc0e3923ae2d43b93f0a
font_02_sfnt_off000118c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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