Malicious PDF — malware analysis report

Static analysis result for SHA-256 82462f4a35c4f75c…

MALICIOUS

PDF

100.3 KB Created: 2021-04-02 03:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81370c50a61974cbbee9881ceada0d26 SHA-1: 96298e0304b2323ab7659047ef9cc606d443e68a SHA-256: 82462f4a35c4f75c05bf6d1c50575608ebce4d391c7beffad60f15caa4a581fa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=causas+de+abdomen+agudo+no+quirurgico+pdf
    • https://cdn.sqhk.co/momujolo/ZJjaMgg/ordinal_data_analysis_methods.pdf
    • https://cdn.sqhk.co/sodelaranu/gjKijhY/descargar_head_soccer_la_liga_2019_hackeado.pdf
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/04ab229fd166036.pdf
    • https://cdn-cms.f-static.net/uploads/4482206/normal_6037a88d65846.pdf
    • https://cdn-cms.f-static.net/uploads/4403129/normal_6053361696909.pdf
    • https://cdn.sqhk.co/tifozeborot/dpGgjzL/download_map_minecraft_pe_modern_house_full_redstone.pdf
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/ketode.pdf
    • https://cdn-cms.f-static.net/uploads/4471106/normal_601ef90c3a055.pdf
    • https://cdn-cms.f-static.net/uploads/4482618/normal_605be64ba26a0.pdf
    • https://buroxaserojer.weebly.com/uploads/1/3/1/0/131070485/wovefiwopogerinafelu.pdf
    • https://cdn-cms.f-static.net/uploads/4386089/normal_6034dd73a7691.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d82d24a8-5090-4493-9b8a-0961210b3358/aviation_weather_forecast_map.pdf
    • https://uploads.strikinglycdn.com/files/048b0090-be8f-4951-84af-bed17149a600/what_streaming_service_has_the_lord_of_the_rings.pdf
    • https://uploads.strikinglycdn.com/files/5c39b99b-2550-4c5c-ace9-484cf3011b23/magnum_inverter_remote.pdf
    • https://uploads.strikinglycdn.com/files/8ef6bac0-565f-43e8-9802-b7fb6639e362/why_is_my_printer_not_printing_color_right.pdf
    • https://uploads.strikinglycdn.com/files/666952f3-b9b8-4dc2-a3b8-a5b6878c5330/riludone.pdf
    • https://uploads.strikinglycdn.com/files/2a1c4f1c-397b-47df-bb02-cd2ae137f68b/kenmore_portable_air_conditioner_8000_btu.pdf
    • https://uploads.strikinglycdn.com/files/7d207c72-e8b2-4cad-b6cf-4dd40c003885/teravidaxediwuru.pdf
    • https://uploads.strikinglycdn.com/files/f46d034e-8df9-4ade-a579-0e5fe5c4d3f5/kilaposipebubode.pdf
    • https://uploads.strikinglycdn.com/files/e7ac7f4b-06d9-4e25-8fb1-98cdc594386e/kivarolarelexumakabijebu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013282.bin
b0057395906fde213253f3268f1ff6ac6424d4a1b6e421ca871304f4c42b5568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13282 5616 bytes
font_01_sfnt_off00014575.bin
1394302276adb61a5f0ce308fca21882d6ef74a756232215dc0e6ac893995511		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14575 11904 bytes
font_02_sfnt_off00016c86.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C86 16204 bytes

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