Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2619a70abbfb76…

MALICIOUS

PDF

77.9 KB Created: 2021-03-23 12:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bc6a90a78d0ea7d9a2064a888dc51c61 SHA-1: 3d3632958edb8d9cd6484a6a8818e0d7724fa1a9 SHA-256: 0b2619a70abbfb760126be23342e222d40b1a1ad01e1fe8dc36093b780f4c983
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9991

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://seumenha.ru/123?utm_term=hdfc+cancelled+cheque+format PDF link annotation
    • https://cdn.sqhk.co/juzogimuju/zhdifhe/gidedapex.pdfIn PDF document text
    • http://mimedilubaj.22web.org/aspirin_different_dosage_forms.pdfIn PDF document text
    • http://loruwifu.22web.org/vokijawog.pdfIn PDF document text
    • https://cdn.sqhk.co/kezomerameki/SJigfih/39216081927.pdfIn PDF document text
    • http://wexoxunesixu.iblogger.org/freehold_wow_dungeon_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/jjhjfhf/vekalobomu.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/jdhgidQ/best_potential_players_fifa_20.pdfIn PDF document text
    • http://tesidakikize.iblogger.org/holy_smoke_1999_parents_guide.pdfIn PDF document text
    • http://tosezepokonone.iblogger.org/56484705184.pdfIn PDF document text
    • https://cdn.sqhk.co/tadeketoxab/1Y07icz/shooting_games_free_online_unblocked.pdfIn PDF document text
    • http://fizovovapoz.iblogger.org/candy_crush_games_free_full_version.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b192ae13-64e4-47cf-8aa7-5bfc5b08da84/bazajami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b17dcdc-ce3b-4409-9f5b-c9725b9c632d/the_zookeepers_wife_book_sparknotes.pdfIn PDF document text
    • http://tibilekozox.epizy.com/apache_maven_3._5._2.pdfIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_5f2937a3a87a47ca846d8ae416ad6c73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10407c9b-a779-4f96-a220-357b72f24879/jilaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b71bf87d-ce88-49b2-b69d-50e34c17dfe7/dixofifimitapimeniwetor.pdfIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_91beee6bf424494581ed9b159a7bd593.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa445199-c8bc-4f87-acd4-df1727046c9e/calories_in_el_pollo_loco_flour_tortilla.pdfIn PDF document text
    • http://nejasixefunik.rf.gd/honeywell_ademco_security_system_manual.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_9b9032b55675437a91a75687e348e23b.pdf?index=trueIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_318a140402b445c3837dd88d343c008c.pdf?index=trueIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_2a943b1ec5c04252927e61ee90a8175f.pdf?index=trueIn PDF document text
    • http://ralenosozizog.epizy.com/gujarat_budget_2020_19_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb657ca-821d-410d-b43d-e802c0830c80/nuxudijipoluni.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_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 5168 bytes
SHA-256: 8269be1eeaac3d4d1b742fd29f2c54d90bfc33a90a6cdffb29a4347eeffd3f45
font_01_sfnt_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 11112 bytes
SHA-256: 52b6c342dbf62c6b2c8c373641e25c947ee2da4336f3ff1b67ae6cf95cadf8fc