Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f40923977fd5e7…

MALICIOUS

PDF

84.9 KB Created: 2021-04-14 08:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8daee91dc2cc131f16f8632fc76a733a SHA-1: 1f48a36ac3c727a368146117ad5d7e9c3e77b181 SHA-256: a8f40923977fd5e7f763a729289bd75c109bd77834202d776faaf5b650fe76dd
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure and a password-protected-archive 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 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://midufefew.ru/strik?utm_term=create+login+page+for+wordpress+website PDF link annotation
    • http://zokuzovabodoloj.22web.org/john_deere_gator_825i_maintenance_manual.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/elevator_speech_examples_for_college_students.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/Fhc6gcU/injustice_2_mobile_full_roster.pdfIn PDF document text
    • http://salleapp.xyz/how_to_use_symbolism_in_literature2wjix.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/hcgfrgj/91749640480.pdfIn PDF document text
    • http://vvinorama.website/33939597883gnp3n.pdfIn PDF document text
    • https://jumaxejew.weebly.com/uploads/1/3/1/6/131606465/xixovaloja-bexuxomavad.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/jghhjhh/dynasty_warriors_like_games_ps4.pdfIn PDF document text
    • https://busemuvida.weebly.com/uploads/1/3/4/6/134643921/d2d40e48f4.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/65516249922.pdfIn PDF document text
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/vadakokinan.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/gejeaii/61745962535.pdfIn PDF document text
    • http://kufowawixapiva.sportsontheweb.net/nukepoduxogubitejaxaj.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/jdhc1Fl/phage_display_antibody_library.pdfIn PDF document text
    • https://kerawitoges.weebly.com/uploads/1/3/4/8/134878251/4529671.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gegilifopom.myartsonline.com/77814305059.pdfIn PDF document text
    • http://defakulid.atwebpages.com/bibtex_generator.pdfIn PDF document text
    • http://duribolatajofa.atwebpages.com/54045527991.pdfIn PDF document text
    • http://bidodabamurof.epizy.com/f_test_anova_table.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_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 5344 bytes
SHA-256: b510591a563f250e00348d469612511661f4674c7973571a355ba1c63a04cc7f
font_01_sfnt_off00011f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 10888 bytes
SHA-256: 274ead80fadb2cc2d85a2b77620da11e027db950b18b7139936aa5857d0ead27

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