Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7989160568986cc…

MALICIOUS

PDF

76.5 KB Created: 2021-04-07 09:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9a3c74718591835d5d78dc41e30745ce SHA-1: 531bd2d8742537f92f7246b651baca1d626f584b SHA-256: c7989160568986cca317d2b83ff91d06ec66c4e086ac3224a2247d5bebba6caa
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 0.9995

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://maypoin.ru/award?keyword=igcse+chemistry+past+papers+edexcel+pdf PDF link annotation
    • http://form-lnstagramcopyrightservice.com/743860147669lzk2.pdfIn PDF document text
    • http://feriwokefawu.22web.org/lofikikuruxifi.pdfIn PDF document text
    • http://rukozhop-guide.com/81016343372i0at4.pdfIn PDF document text
    • http://noxesim.iblogger.org/amoxicillin_500_mg_information_leaflet.pdfIn PDF document text
    • http://50off.pro/tippmann_model_98_pricer6o7u.pdfIn PDF document text
    • http://lofuzuwe.22web.org/espresso_english_courses.pdfIn PDF document text
    • http://damvglaz6.xyz/llama_llama_red_pajama_bookonj9x.pdfIn PDF document text
    • http://leftoutclub.com/nukigumujunawejobazebixikscao7.pdfIn PDF document text
    • http://fakts.design/what_are_descriptive_wordsfg836.pdfIn PDF document text
    • http://hotloveme.online/what_does_it_mean_when_the_maintenance_required_light_flashes_on_a_honda_accordtiueb.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/39f70537-4791-4d96-8f52-2b3ec9d331d6/loxezewexa.pdfIn PDF document text
    • http://tirimetepuxir.epizy.com/doturon.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/4519051793.pdfIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_703c1414386d4d2b818d6866356b0727.pdf?index=trueIn PDF document text
    • http://muzizax.rf.gd/51569129135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ffb1839-70fb-4afa-9221-fe15a97b57a2/books_of_the_bible_bookmark_free_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/zususuzitowa.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/peziwabuzaxadulowotop.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/dzmm_radyo_patrol_flash_report.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_8d9886a6354f44b285d869d222632d18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd7cee4c-3871-4972-835d-b2c928da3ed2/commodity_credit_corporation_number_of_employees.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_2e33076cdd38457a84f4a3147f04ba6c.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_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 5676 bytes
SHA-256: e4662625dc4a185cd746e65b73b6f9af24131319f265395c00c2bb4a49e39d5c
font_01_sfnt_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 10908 bytes
SHA-256: 944967114c90fba7bdab1ea454b51396a437c66b0a96ba2934f32e60ddc87020

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