Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9f2361bca68e6b…

MALICIOUS

PDF

99.6 KB Created: 2021-06-04 05:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 86c4fda39b83bc057f9b2b9cedb2930c SHA-1: b0403d6fb4eb78d3c04b5c983aa8e407f36dd4ca SHA-256: 4e9f2361bca68e6b2a57bbaef8f5dcdf8448af458533105faed0b2b83a239153
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 0.9949

Heuristics 5

  • 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 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://crewmak.ru/pbw?utm_term=when+it+changed+joanna+russ+audio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376125/normal_600ad953c6edf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376096/normal_604ddce1bcb46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413982/normal_6002598a356c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497082/normal_605d256436a15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_6015c4a63e8c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_604cba9aab1ad.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/60c98516-952d-4368-a553-581c76083f14/traktor_s4_mk3_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e84bab9-8c0a-4b0a-aa07-9a2cabcd0e1f/tasco_luminova_telescope_578_power_review.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/f/lanalakegukefakunagas.pdfIn PDF document text
    • http://wikitaxif.pbworks.com/w/file/fetch/144580086/what_happens_in_the_cursed_child.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/w/file/fetch/144544356/what_is_codominance_and_incomplete_dominance_with_example.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144467178/exercicios_resolvidos_trigonometria_9_ano.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144415806/convergent_vs_divergent_thinking_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12ec9c2-da9d-4d6c-a874-2a8836b674d2/38649896018.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144475863/mitsubishi_lancer_user_manual.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/16459626087.pdfIn PDF document text
    • http://mevuteled.pbworks.com/f/barbie_izgi_filmleri_full_izle.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/w/file/fetch/144587679/algebra_and_trigonometry_structure_and_method_book_2.pdfIn PDF document text
    • http://jejosuxiz.pbworks.com/f/what_to_say_for_1st_wedding_anniversary.pdfIn PDF document text
    • http://kunixove.pbworks.com/f/how_to_get_command_blocks_in_minecraft_bedrock_edition.pdfIn PDF document text
    • http://zusemivak.pbworks.com/w/file/fetch/144535050/how_to_connect_coolpix_b500_to_snapbridge.pdfIn PDF document text
    • http://fuvotobike.pbworks.com/w/file/fetch/144584574/8093014273.pdfIn PDF document text
    • http://ganosidil.pbworks.com/w/file/fetch/144453210/cant_find_local_files_spotify.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ca84d2-061d-4cea-bcc6-2000733505b9/68408200739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95396a1e-5310-4604-a5a4-caf94775a51f/weber_smokey_mountain_recipes_ribs.pdfIn PDF document text
    • http://popuwepux.pbworks.com/w/file/fetch/144588777/96553844045.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 29692 bytes
SHA-256: d092d9ae50e997239e3eeccb8e73efd3e47726890d53465dfad400dce2e2559b
font_01_sfnt_off00014a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8B 5260 bytes
SHA-256: 5f0d449d6f0d6e289c5723a68864095d228b68137fc332dc5f62700dd1e44265
font_02_sfnt_off00015c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C75 10576 bytes
SHA-256: 751e355aeb1c8348677918ffd550f8d16e8865e7b2cc29157f9e9e5b42298e62