Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bb2b504186d8fd…

MALICIOUS

PDF

75.0 KB Created: 2021-02-23 22:51:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1940e48b368311e4d0d54438e1ef86f1 SHA-1: 8fd4c1dc0a497d23fc918c6b9c6044f9b79423f5 SHA-256: c5bb2b504186d8fd2a3138672d6379ca0d608b198c0bebfc75a91c0b76c4c080
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

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/123?utm_term=what+is+the+difference+between+devils+and+demons PDF link annotation
    • http://fruit-italy.space/tazakukujefopzq6rj.pdfIn PDF document text
    • http://liolika-rsya.ru/niwusezukodukemfpgj.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/hbighiQ/zebopikadujajusi.pdfIn PDF document text
    • http://fruits-summer.fun/pofiznko8d.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/Mojgvhj/17037495735.pdfIn PDF document text
    • https://cdn.sqhk.co/golizojuw/jeic4ig/44964001733.pdfIn PDF document text
    • https://cdn.sqhk.co/gasariba/Mjjhhcu/digidesign_mbox_2_mini_driver_mac_mojave.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/hagjdif/dream11_ludo_game.pdfIn PDF document text
    • http://teachersaid.fun/cyberpunk_2077_gameplay_1_hour8ae4o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383295/normal_5ffaec44a4062.pdfIn PDF document text
    • http://itawegan.space/free_black_eyed_peas_the_timeb8ybv.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/gfPjfjd/world_war_2_memorial.pdfIn PDF document text
    • http://apple-fruit.space/canadian_vehicle_bill_of_sale_formshcg4.pdfIn PDF document text
    • http://arevakar-travel.com/dolenazilz6sk9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_601e7af736fe7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuvelar.epizy.com/sifekarejebiwinotezuja.pdfIn PDF document text
    • http://nisoruv.rf.gd/sunfish_mainsheet_swivel_block.pdfIn PDF document text
    • http://mezomiwewelebe.epizy.com/gb_whatsapp_transparent_update.pdfIn PDF document text
    • http://fomudugeriju.epizy.com/99286672008.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_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 5568 bytes
SHA-256: 02f553003d221171cc84d7402698bb2c887a60c6fec06e9151e96fe5eaa30bac
font_01_sfnt_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 10208 bytes
SHA-256: 3d1b41a590da310deb30e84ab36ac96493b4e58a36403cfaf15b964fba013f27

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