Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d5dd06be47b7bc…

MALICIOUS

PDF

79.0 KB Created: 2021-04-02 00:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 81a24dc0fb4bcd6795869fbc32e4e093 SHA-1: ca6e74fa999063fa69867da4b578b9ed6ef97679 SHA-256: a6d5dd06be47b7bcf3dc78217f8a5c40e76bc1bbe22ae7c60646f96ab85d998b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by both ClamAV and an ML classifier. It contains a significant number of external links, with some hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to potentially harmful external websites, which is a common phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • 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://druttle.ru/123?utm_term=ukulele+sheet+music+books PDF link annotation
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/7552896.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/fgehjii/36403437823.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/jatjE7z/49645467531.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/gggdts6/vozageris.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/ihhegiw/1128559447.pdfIn PDF document text
    • https://cdn.sqhk.co/bovuzane/gdMUFjd/vebumedalovevabotug.pdfIn PDF document text
    • https://fanesorugetefex.weebly.com/uploads/1/3/1/3/131383934/4ebde7bd14811.pdfIn PDF document text
    • https://dotudamel.weebly.com/uploads/1/3/5/3/135326114/6403500.pdfIn PDF document text
    • https://mokitapakajare.weebly.com/uploads/1/3/4/8/134885173/07d7aef1998.pdfIn PDF document text
    • https://rojabufofunos.weebly.com/uploads/1/3/0/7/130776514/nekerevesuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beninoduvewer.epizy.com/adb_install_apk_failure_install_parse_failed_no_certificates.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/detailed_information_about_football_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b708ce23-3715-4fb1-bdfc-2475bbd9df40/how_to_turn_on_fagor_oven.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/74503712487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da7347e9-f373-4ea0-ba95-c8cb740e5b1d/dark_alliance_baldurs_gate_ps2_cheats.pdfIn PDF document text
    • http://tutalagu.rf.gd/luvugaruritesamisiwasinon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/197223aa-265e-4bb0-8118-4ae785594977/jogotewusosunazuzujorok.pdfIn PDF document text
    • http://lidikulogape.rf.gd/adobe_reader_apk_cracked.pdfIn PDF document text
    • http://dobejefazari.rf.gd/learning_numbers_in_english_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b113094d-4c4f-490e-9f05-2155e66ca44c/55125233772.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/oldest_betty_crocker_cookbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00bf59d-d01a-437b-ab30-987f0ac2c52a/analog_electronics_course_objectives_and_outcomes.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/ap_chemistry_equation_sheet_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc164167-4d83-4ca3-92e1-d7897b68da14/big_water_fish_market__restaurant_siesta_key_village_sarasota_fl.pdfIn PDF document text
    • http://zaxilofekuji.epizy.com/24651832824.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f125bba7-76f7-47fd-aab0-9dd4bb33b03f/binupumamizi.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_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 4928 bytes
SHA-256: 036b40ca9c8066804c5df5bcc43e8b57c42b8920b9dc158532313fc36fa17c61
font_01_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 10932 bytes
SHA-256: b6c524c98d37bd105f1d1c9ad56b6dec7a3f35ebb1ef89c013d4c9017b0217ea

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