Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d2f6ef14de369b…

MALICIOUS

PDF

75.4 KB Created: 2021-05-06 01:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 03b0c803f57aa96fbce5130cf2410ce6 SHA-1: 54cff3c856dd44ebc96528b190b1acfba17a81af SHA-256: 66d2f6ef14de369b6f445f34c9b986a52c13cbe3c767193a4e1bc56958ffee19
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) 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 0.9997

Heuristics 7

  • 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 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/strik?utm_term=skyrc+imax+b6+mini+calibration PDF link annotation
    • http://nejupike.mygamesonline.org/59038203670.pdfIn PDF document text
    • https://xomugiwonin.weebly.com/uploads/1/3/4/2/134266294/e023a.pdfIn PDF document text
    • https://lizoduloto.weebly.com/uploads/1/3/4/7/134701777/1371189.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/dhbje3K/33182331454.pdfIn PDF document text
    • https://cdn.sqhk.co/mezewimaxus/vibjc5W/packers_injury_report_vs_bears.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/dl10FBH/zexixetenojaxamufevuw.pdfIn PDF document text
    • https://cdn.sqhk.co/doxelatofon/w3zokhe/limousine_taxi_car_driving_free_games.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/icwvfih/21089175539.pdfIn PDF document text
    • https://nuliludozaremul.weebly.com/uploads/1/3/4/8/134887499/9766946.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/3EjiCU5/acrylic_nail_designs_white_and_gold.pdfIn PDF document text
    • https://cdn.sqhk.co/gixixutiji/1DPkjcV/warhawk_rocket_launcher_tf2.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/icibyji/joxatafedeb.pdfIn PDF document text
    • http://rulajamizap.getenjoyment.net/gate_2020_syllabus_mechanical.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/buwosevax/wobif.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/99705467713.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/pastel_accounting_tutorials_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/hungry_shark_hack_mod_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/13470182118.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/bass_guitar_how_to_read_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/gitevofu.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/the_disaster_artist_film_imdb.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_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 5400 bytes
SHA-256: 325e9ef5817e987b3b8f4b68d558bcbb944a2a7d7cb6d3e7f2a3659ccf6736eb
font_01_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 10948 bytes
SHA-256: a8fd3ea30c62e6ef16d8f0b41da9dfeff9faa8ad02f7f5b923daa2bce343cc59

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