Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b6712fd49f1c6c…

MALICIOUS

PDF

76.9 KB Created: 2021-03-05 02:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 16fd8f2bb3b7211c941b4105a0531b9a SHA-1: dc7ec59d67a324abaf3fe9dfa5c216f8d42e53a7 SHA-256: d6b6712fd49f1c6c04d4a25a8e938db2efd01b5f842ec1b1f0269b35c397aa13
126 Risk Score

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 0.9993

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://leonvi.ru/strik?utm_term=noughts+and+crosses+book+series+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456728/normal_5ff3b287d7968.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/gfqlSjg/pixel_art_kawaii_comic_color_by_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/fcBb8ij/ritexixar.pdfIn PDF document text
    • http://aicberg.net/darren_sammy_national_cricket_stadium_weather_report1n4ml.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460072/normal_600d8ddd092fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378604/normal_5fce950772126.pdfIn PDF document text
    • https://cdn.sqhk.co/disidudi/AgeoXPE/duck_hunting_boat_blind_designs.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/jbdMPjE/rush_limbaugh_radio_station_minneapolis_mn.pdfIn PDF document text
    • http://cmb-eco.com/876404982991j9uu.pdfIn PDF document text
    • http://nubolats.xyz/shazam_lite_apk_mod8ryet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418391/normal_600f63677e9a1.pdfIn PDF document text
    • http://creditstar-kabinet.com/11515645313qn1z7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411696/normal_5fdca43f26c21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426087/normal_6031ec3ba40ae.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/dvIChfD/jowabibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_601fc4d6bada5.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/mogedozara/self_compacting_concrete_mix_design_excel_sheet.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_d6f3bf9c47154aedb54c483cdf9e7abb.pdf?index=trueIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_e6bccea9818e408aa00d4c176f908094.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_7cab5e95ad984eeb98ef39c9dfa5a1a4.pdf?index=trueIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_2d5dd5e9a266468589ab87d75b37aa80.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/sezagor.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_c8049b06ce194e42a2312baa4ad6f9ff.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_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 5596 bytes
SHA-256: 11f31e629752baaf2a7f1f427145b2c01b288ead142a064380e999c867a517d1
font_01_sfnt_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 10496 bytes
SHA-256: 87f57f667593b3b699effe093e048af356fbf890af55407605df7a38e435304f