Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dee31b622f8c42c…

MALICIOUS

PDF

83.7 KB Created: 2021-03-13 19:56:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bf9348e566480528899c8373591cc4d8 SHA-1: 10f95f87b88ae7574c3d0fc54f76b9e817818109 SHA-256: 8dee31b622f8c42c781ac708e474acd76dd5e688c3129606662939e853b30638
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 0.9992

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://midufefew.ru/wix?keyword=algebra+2+regents+january+2019 PDF link annotation
    • https://cdn.sqhk.co/ketalidukepi/yigpGhb/impossible_game_practice_mode_song.pdfIn PDF document text
    • http://retys.fun/gdpr_compliant_email_templaten1sii.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/Kiehdsx/zobabuxazijizuzuwuru.pdfIn PDF document text
    • http://dombitarf.ru/zufuresipiwavuvimapabijedyn0aj.pdfIn PDF document text
    • https://cdn.sqhk.co/farategibod/mP2G2S8/51611045285.pdfIn PDF document text
    • https://cdn.sqhk.co/tesosunimew/jcgigjS/xoposizipanizovizesosubu.pdfIn PDF document text
    • http://dreamingdeveloper.com/806384389489k0lt.pdfIn PDF document text
    • https://cdn.sqhk.co/zudoputasafe/gdAiijd/vegutajuwofojezozowejo.pdfIn PDF document text
    • http://bigtittybella.com/machote_de_contrato_de_arrendamiento_en_word9ynep.pdfIn PDF document text
    • http://baffer-shop.space/fupuriwiapfub.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/4f7484f2-2ab2-4814-a60d-7571f71876d3/download_walmart_grocery_app_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/fevexamidugazuf.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/19322259875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37443017-6135-42df-b6ff-646139d6cf3d/fefixemexutifawunuzorufe.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/zorilipelanaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685a2992-e755-4bdf-8425-e88258329642/7801902365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3313fa2b-ba1b-43f9-808e-74cb70e38314/verbos_en_ingles_en_pasado_participio_irregulares.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e8a3a6-fdcd-4b21-a7d2-0e30e4b60164/hogwarts_a_history_book.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/icd_10_code_for_bilateral_bunion_deformity.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/is_there_a_secret_app_on_my_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/340ce4c4-c60e-4612-8c7d-aa20907f9a37/apollo_horticulture_grow_tent_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a37e54f0-4c08-49a5-aea6-4e7698f26904/12947123823.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/breezingforms_joomla_3._0_free.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_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 5644 bytes
SHA-256: 526b58953a325a986c405bdfed5cf9fda1f5e86239269782e9ac70c3c61b5888
font_01_sfnt_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 11292 bytes
SHA-256: 3ec469c8162f4640b7e310bb8ec04bd292fdc6adae901a59f3a4af3d9cea6f35