Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dc461d85e0bba8…

MALICIOUS

PDF

74.9 KB Created: 2021-03-11 01:12:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2270128c7b94bd3c169fcfa359745bb3 SHA-1: e856440d65f8f6d96dc20f4df892e13554c22022 SHA-256: 99dc461d85e0bba8068b0b08c8c93e46154f6669c245e03b933a059a48df4d2b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of external links points to a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=guidelines+liver+enzymes
    • http://getyourcredit.info/how_to_write_an_argumentative_research_papergmg1m.pdf
    • http://yazansoft.com/25517000718beegr.pdf
    • https://fagugirawax.weebly.com/uploads/1/3/4/3/134388021/zagogemutunas.pdf
    • https://jopomewimedadi.weebly.com/uploads/1/3/4/4/134465277/gutiribupep.pdf
    • http://creditpm.com/46172494538aaik0.pdf
    • http://1xbet-regi.site/doguma8e5p.pdf
    • https://jerepukiw.weebly.com/uploads/1/3/2/6/132681878/c60be891415b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_d20d67bf056241ea821a183b95acb927.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2eb00bb0-473d-4c86-ac41-4d3e1d5e34e2/putaziwadesiwan.pdf
    • https://uploads.strikinglycdn.com/files/40157648-dcf5-46ad-b086-2ceafefdb2c0/36336668884.pdf
    • https://uploads.strikinglycdn.com/files/e02a559d-1f35-452a-90f9-0e3c82e72598/free_cdl_license_training_nyc.pdf
    • https://uploads.strikinglycdn.com/files/63047c74-0ef7-4869-a067-9e810a0d8800/41042856452.pdf
    • https://uploads.strikinglycdn.com/files/53f1a172-5b84-458c-b72a-9fd34b9e5d71/ver_el_principito_online_latino.pdf
    • https://uploads.strikinglycdn.com/files/91dab1b9-cfe0-4408-a7ba-ec1d39baadb8/intermatic_timer_model_t101_parts.pdf
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_efb2ecb4536a4b90a66bba5dd74aa594.pdf?index=true
    • https://s3.amazonaws.com/fajixe/sevadofifikufovokek.pdf
    • https://s3.amazonaws.com/niporofez/network_cable_tester_manual.pdf
    • https://uploads.strikinglycdn.com/files/e1307eea-441a-45f6-82e4-8f004f5ab60e/44060811934.pdf
    • https://uploads.strikinglycdn.com/files/46e0eb6b-98be-4d11-aeff-11be98a25b8e/unity_sizer_download.pdf
    • https://uploads.strikinglycdn.com/files/3ccb3729-e470-482b-9ce8-ff41f7d86a11/kingdom_hearts_guide_agrabah.pdf
    • https://uploads.strikinglycdn.com/files/8a150ff5-d5ee-4008-af12-c30bcb86766a/how_do_i_use_my_canon_camera_as_a_webcam_windows_10.pdf
    • https://s3.amazonaws.com/daxemo/22928934206.pdf
    • https://s3.amazonaws.com/papuja/hp_officejet_7110_all-in-one_inkjet_printer.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9cd.bin
a2a4a9f5d28aaffc2a2aa92f88fe085eea4a0f088aa7c61dc014ad65c0fb9f2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 5004 bytes
font_01_sfnt_off0000fad1.bin
88c2db5483006e2c431bbd4024796454c9e25007dd223decce59b784558dba9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 10240 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.