Malicious PDF — malware analysis report

Static analysis result for SHA-256 d650efcc42657969…

MALICIOUS

PDF

71.8 KB Created: 2021-02-26 18:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 02a6b8a5bfddf20ae1eba6ae80d7f8a5 SHA-1: 3a2da6767f5bd1234265f0d93a544337e0fae4e6 SHA-256: d650efcc42657969f1493af7793a0232e68d209a647579701eae4c46cb8cff6e
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 0.9997

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=sketchup+app+free+download PDF link annotation
    • http://lidlid.xyz/aerodynamics_of_aeroplane_wing5r207.pdfIn PDF document text
    • http://differencecheats.net/viral_carcinogenesisgnneh.pdfIn PDF document text
    • https://tiparopodewab.weebly.com/uploads/1/3/5/3/135340776/448a565507212.pdfIn PDF document text
    • http://fartook.online/microsoft_sharepoint_online_training_for_beginnerszzeff.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/download_dancing_line_2_modhhnp5.pdfIn PDF document text
    • https://jejaxeka.weebly.com/uploads/1/3/0/7/130739175/ribesetikila.pdfIn PDF document text
    • http://galoomer.online/cisco_nexus_1000v_hyper-v_download99um6.pdfIn PDF document text
    • http://d2-club.ru/bts_glitch_live_wallpaper_downloadlhgaa.pdfIn PDF document text
    • http://look-hotel.com/9466658191g2e1t.pdfIn PDF document text
    • http://rodina38.ru/86230670038qgk6d.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/nevowimo/bitotinekimibadetid.pdfIn PDF document text
    • http://rulumagevamed.epizy.com/37694099179.pdfIn PDF document text
    • http://jorowubibe.epizy.com/online_marksheet_verification_haryana_board.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_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 5324 bytes
SHA-256: 608b62234ba155fc4c33e185a965fb82ff46dc3f6a5b7c46b8678660dc4f7153
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 10048 bytes
SHA-256: 7b92707851e59abbb8bf79199b9332df6a7341b7c03315c57d54c98e396a53b3

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