Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e675d50cc0f720…

MALICIOUS

PDF

76.6 KB Created: 2021-03-31 17:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8e22d0f1dd92b3cafbf71fbd2d47e514 SHA-1: 0f0229a46e3165942c7f746e5296ea1dfb1c20db SHA-256: b7e675d50cc0f720290e4f5b07f3b26a42101df65075e71e4abf9ccfab384506
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-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://soxebez.ru/wix?keyword=parabola+real+life+pictures PDF link annotation
    • https://cdn.sqhk.co/tamoravuwera/giichjA/9120113114.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/ie83jcC/mini_block_craft_2020_craftsman_games.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/xZiahba/steam_train_simulator_games_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/6jgnrHS/62504330892.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/jVJhgoO/obd_mary_obd2_car_scanner_dashboard_on_elm327.pdfIn PDF document text
    • http://twobigs.space/85201534984nmtlj.pdfIn PDF document text
    • https://cdn.sqhk.co/lonubugogere/SUibHnT/clock_change_spain_2021.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/nVjdEgd/kiwetifidolikofan.pdfIn PDF document text
    • http://sendgrid-de.com/sandisk_clip_jam_vs_sport6ihg4.pdfIn PDF document text
    • http://ideal-it.fun/data_specialist_interview_questions_and_answersrol1b.pdfIn PDF document text
    • https://cdn.sqhk.co/kejopala/HqNnJjj/best_free_photo_editor_program_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/dusivubeleza/5rw1rgc/brain_test_2_prison_escape_level_20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_302ba00b602d47039a2f84db095bf8a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25e0bd62-705e-43c4-89d0-1e763d656cb9/el_lazarillo_de_tormes_capitulo_1_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6248ba67-1c36-4aa5-a491-a1ff0003f7ac/how_much_is_an_original_copy_of_a_christmas_carol_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb22891-04bf-42ca-a315-e190cdfc1905/what_medical_specialty_pays_the_highest.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_f0f4d30185594a57b6e45e87befcea0d.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_2069dc7098bb447d84eec33079940175.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/247d9ea7-f0bf-4f8d-ab2b-9b34e3eedf80/what_is_group_in_social_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a6b229-edb9-4d7f-ae89-0e606e1c0fb6/xevejovonepeketax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0790fc05-2568-46e4-b7fb-04508b4d814d/98236323615.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_32e16003912044c3ba116acf30b1a9a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb9e52b1-0258-47ed-b843-116aed481f95/xumegebakem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2108959-ad48-43fa-8c84-aaa671bb2aa4/gizuwefewefogiwimikevis.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_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 5152 bytes
SHA-256: 8400158a0d94d3adb7782f96ba63d71142d82854e789909618af4a121a86d88f
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 10380 bytes
SHA-256: 2665bae06a3ba4e3d980cdce8819f7059cb4c29cb6ab5b09644213b683772fbb