Malicious PDF — malware analysis report

Static analysis result for SHA-256 287b1564f2174623…

MALICIOUS

PDF

81.2 KB Created: 2021-03-18 02:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6c4b08cb7ea83f32e36182edc8d3a7a7 SHA-1: 243bf6db5186793b7464220e6d3627f1f93d9c1a SHA-256: 287b1564f2174623b7d4d8c9526caf9dc155d281358a65fb1964d2734deb2f4b
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 0.9887

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://jottigo.ru/award?keyword=collins+easy+learning+chinese+characters+pdf+download PDF link annotation
    • http://bunewumokir.22web.org/58837879672.pdfIn PDF document text
    • https://cdn.sqhk.co/lajakukilo/gdyojcq/crowdsource_platform_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/bivosemubo/hgh5df5/lebara_recharge_germany.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxiteparam/gMgdLja/toxijizekosuzujidixobaju.pdfIn PDF document text
    • http://topsalon.xyz/how_much_salt_do_you_put_in_a_vicks_humidifier5f0lx.pdfIn PDF document text
    • https://befutoxe.weebly.com/uploads/1/3/4/4/134443098/witesisosexuwov.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/7Kgetgi/94067132551.pdfIn PDF document text
    • https://verefatodefi.weebly.com/uploads/1/3/4/7/134722939/eab378f0f48d.pdfIn PDF document text
    • http://biomaniks.website/titan_quest_anniversary_edition_gameplay_germannpcyz.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/mosinixawgium9.pdfIn PDF document text
    • https://diwolusetu.weebly.com/uploads/1/3/5/2/135299278/7152729.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/dabokemamejix_jogufenazupu.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/buxoparadazegu/espresso_english_level_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88fd7cc-9606-456a-a067-0e937f3e2fde/nikon_coolpix_s33_battery_exhausted.pdfIn PDF document text
    • http://kuwubuvorij.rf.gd/newspaper_design_template.pdfIn PDF document text
    • http://sedekebokavid.rf.gd/59476537146.pdfIn PDF document text
    • http://darelarara.epizy.com/brothers_telugu_movie_songs_2012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ed350d-cc77-4da8-a0a8-8e7217ed5a16/review_fone_qcy_qs2.pdfIn PDF document text
    • http://rapevuf.epizy.com/98036422405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf10e7d-6c70-4288-8f0e-2a0f0f3cc61e/56261414569.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/49000361910.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/how_to_start_my_own_music_publishing_company.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67334f1c-ace1-4326-949b-89533eee78aa/ti-nspire_cx_ii-t_cas_emulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b1b330-4abd-4eae-b5b6-53f3672c6322/68099082073.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/67296217943.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/dotifaromogijinoga.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
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 5516 bytes
SHA-256: 4daa62f32955818a8d999471ab14a21cc2bebbfc69fa3a76c8fa01f2891f9c7a
font_01_sfnt_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 4828 bytes
SHA-256: e5c0b63f8726e84992a04b15d8931c6de839acc67d4dab74379c5e821efc65d8
font_02_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 9916 bytes
SHA-256: f9e85155c3a9c1fda7cebce3de5eb319a411893ed4252cc2b8b3e07619c29a84
font_03_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 16784 bytes
SHA-256: 35ea41303a981776dfd757d19f41142fc677ae0ab3457fa3fce551cf666412b5