Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17c9b5cbf3486cc…

MALICIOUS

PDF

72.7 KB Created: 2021-03-15 17:19:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8bf0d97e79ad345dec357667f98de27b SHA-1: 115bb1bfc85c34a5e989e92541f2e9d9dad6e3ab SHA-256: c17c9b5cbf3486cc64e7e7acf2d5770734cc83c9214156b7209347ca2a054de9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jottigo.ru/wix?keyword=michael+faudet+pdf+download PDF link annotation
    • http://loxebosobudi.66ghz.com/lopiluzuripawetida.pdfIn PDF document text
    • http://1green.space/1417841578222h31.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/kunibasobavetolodix.pdfIn PDF document text
    • http://ranking-se.com/tum_hi_ho_instrumental_midi3m0ys.pdfIn PDF document text
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/weminexugeloruk_bilojiligixob_wufexakubesi.pdfIn PDF document text
    • http://wobokegidutijem.iblogger.org/zezorewemasubasivoda.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/what_is_the_best_roku_model211lt.pdfIn PDF document text
    • http://nuzimes.iblogger.org/budgetary_process_in_kenya.pdfIn PDF document text
    • http://merishwheelrecords.com/62737211798tt0px.pdfIn PDF document text
    • https://munibejexa.weebly.com/uploads/1/3/1/4/131414516/nurisutigazun.pdfIn PDF document text
    • http://klosheff.xyz/reaper_miniatures_kickstarter_2019ptv81.pdfIn PDF document text
    • http://sy0n.icu/what_is_self_directed_behaviorml3pj.pdfIn PDF document text
    • http://mebel-albero.ru/72818200346uhvod.pdfIn PDF document text
    • http://avtoshkola-region26.ru/64534581770w8h0m.pdfIn PDF document text
    • http://yachts-4-sale.com/zigevadabatevurxarh1.pdfIn PDF document text
    • http://fineagencyy.com/ladebofewoxibc6rut.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/zegav-lotapanatarel-gumatunejenabu.pdfIn PDF document text
    • https://kuzirorox.weebly.com/uploads/1/3/0/7/130775715/feb76fb.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/back_strengthening_exercises_for_lower_back_pain.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bupujipa.epizy.com/geotechnical_report_nz.pdfIn PDF document text
    • http://duvodix.myartsonline.com/classic_human_anatomy_book.pdfIn PDF document text
    • http://wekazuvenasiwuf.epizy.com/nutritional_value_of_oyster_mushroom.pdfIn PDF document text
    • http://laxuzoto.onlinewebshop.net/bemegagagusiriso.pdfIn PDF document text
    • http://vepitejususas.atwebpages.com/best_spirit_blossom_ahri_chroma.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_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 5068 bytes
SHA-256: 4764602f5acd1e384172c6afa4bba710bb96e7025f17d1d4e4cf58f6edeeebb8
font_01_sfnt_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 10336 bytes
SHA-256: b47cccb7a58bf75f414cab2ee867e67f61958063edca73359bd706a153bff3bd

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