Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0b42844f77c458…

MALICIOUS

PDF

77.6 KB Created: 2021-04-05 06:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e9c0f5aed31a7dbcc3cd033a249f3322 SHA-1: e125b9aa9831602ab1d2b55a33c973c5aabb9c6e SHA-256: df0b42844f77c45800026f40022bd72e55e8a803494e39d1d2c6874130b64709
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The embedded URLs suggest the primary goal is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jacksth.ru/123?utm_term=aurangabad+city+bus+timetable+pdf PDF link annotation
    • https://cdn.sqhk.co/vobevufubito/4Hjf2ie/75596556633.pdfIn PDF document text
    • https://cdn.sqhk.co/rarirawibowo/XgeGibw/hitman_sniper_domino_kill_fall.pdfIn PDF document text
    • https://cdn.sqhk.co/koletexun/bZJvhis/busom.pdfIn PDF document text
    • https://cdn.sqhk.co/tukepola/fijUjbt/abc_rhymes_video_songs_free.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/idgdCji/xeropofekuvasidapawimipe.pdfIn PDF document text
    • http://nijowefipegivu.iblogger.org/defazifubo.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/haZgiif/play_tube_for_cats.pdfIn PDF document text
    • https://cdn.sqhk.co/dupamotim/hhbSgem/paper_bag_puppets_templates_dog.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/gp4tL4P/10015351052.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/sjbhjhi/vatolugowesom.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/90c1890f-b650-49a5-add1-f44c22fda08c/panda_express_san_antonio_food_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95b0884-1e7d-4e74-9c31-1e9878f9f399/39220067206.pdfIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_e144da525b6943b6a4a14f39504acf62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e3ea50e-574a-4eaa-a746-33c578c003e8/how_would_you_describe_a_beautiful_forest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03981bde-a281-4bb2-8808-6f1e245ce07e/goxawefekugilevu.pdfIn PDF document text
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_b4a99f8d74944b9d8c718cc333e6f84e.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_c1566710909d46fc83e8b0d8344513aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/252299a1-f2da-4615-a895-50cecacddcbc/if_this_is_a_man_online_book.pdfIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_488149127d7a4144a5ec9262e6fa3f67.pdf?index=trueIn PDF document text
    • http://wuzuruwevirelu.rf.gd/alternating_current_formula.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_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 5708 bytes
SHA-256: 246d2d7724069b0631d0db9c88e0d3710a0f9be06181f96990c48432967afdd0
font_01_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 11512 bytes
SHA-256: 645405daf509b3b630e75db10fd21f832ffa4f16aadad6bf21cf632d46677bb8