Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f4ce080336ad5a…

MALICIOUS

PDF

84.7 KB Created: 2021-03-16 13:33:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 4c929bff1728d16e22f3c23753931981 SHA-1: 0778f41e8507d18c3d66c61238b61dd2a18329e3 SHA-256: 79f4ce080336ad5a907011d56fe68a5862cdcd3a579cc0406410695585a0f134
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable domains and link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/strik?utm_term=sermones+para+jovenes+adventistas+del+septimo+dia+en+power+point PDF link annotation
    • https://cdn.sqhk.co/jaxugaveg/5jhhbLQ/atomas_game_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/tA0hchj/vefofakowemosoxiro.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/teacher_created_resources_inc_answer_key7556b.pdfIn PDF document text
    • http://harmony-market.ru/gebuvususuludimapalovamor1a3e9.pdfIn PDF document text
    • http://daating19.site/jifawopunitijugumopitasam4sv7b.pdfIn PDF document text
    • https://cdn.sqhk.co/fefavezevir/hJ0Xhiz/introduction_to_business_management_study_guide.pdfIn PDF document text
    • http://invitesistem.ru/spanish_alphabet_worksheet86m3o.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/xviaAHM/samsung_blockchain_wallet_download.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/F5rgiKq/tengai_makyou_2_pc_engine.pdfIn PDF document text
    • http://successinyourlif.website/wuxanobuwemuzelawuduwaxudk97e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2c37611a-37d9-4744-a933-e7b6fdd03d36/sandisk_sansa_clip_zip_software_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/petaj.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_2bb9e4612f294aa38d90bd8ddeb5dde8.pdf?index=trueIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_64f67c4b9e6d4276aa7b30245dd5a79b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemazun/race_car_vehicle_dynamics_milliken_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/actual_multiple_monitors_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c9150f-b13d-4ae9-9f39-08af18e48c4b/forgotten_realms_series_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c9434f-3b1a-4ea1-81d8-5fed8b9c390c/2825609516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e75bfeee-db1b-4bdc-8cf0-faf8573c5767/wodufubuvirus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef5f8d84-60e2-4511-acb0-4f74500c9894/how_to_get_a_job_in_public_relations_without_a_degree.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/is_adt_better_than_brinks.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://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_off0000e7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 5224 bytes
SHA-256: 321c38b3f98e05541506408148a250ec44c0fee1afcf96de820794173021ee56
font_01_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 12140 bytes
SHA-256: a59eebd1bb05923854d199674257490bc6aa5a2bee9d5fb99a4c00eccb1141c4
font_02_sfnt_off000120f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F0 16224 bytes
SHA-256: cebb2ee4632955a3019f478c3ddd6797fe6f3065e568267a52f4b079fd487fc2
font_03_sfnt_off00013617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13617 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3