Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ca1b54f19b2fc9…

MALICIOUS

PDF

68.5 KB Created: 2021-04-01 21:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71ddf990a7cf8e388479890de4b86862 SHA-1: 2b20659766c51acdfa4ce99972685e070e15ca5e SHA-256: f8ca1b54f19b2fc92644186f6ce009f97ed45e41d370fbcc997923e458cc6c17
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. Several of these links point to potentially malicious domains, such as vilenefex.ru and weebly.com subdomains hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=suggested+answers+icap
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/busogufir.pdf
    • https://metonokosaza.weebly.com/uploads/1/3/2/6/132681587/459248.pdf
    • https://cdn.sqhk.co/fegadosijete/3hfdggc/chicken_toss_crazy_chicken_launching_games.pdf
    • https://cdn-cms.f-static.net/uploads/4485443/normal_605a4c68da759.pdf
    • https://cdn-cms.f-static.net/uploads/4448094/normal_5fd973db4ce86.pdf
    • https://cdn-cms.f-static.net/uploads/4385422/normal_600fad1e3850c.pdf
    • https://cdn-cms.f-static.net/uploads/4412170/normal_603040d85944b.pdf
    • https://cdn.sqhk.co/roturoda/P2regf3/wefbee_auto_liker_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4366028/normal_60571cb4cc93d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bbb084e3-7d10-4822-b267-a254903c4a96/what_is_4_p.pdf
    • https://s3.amazonaws.com/fobupojowojon/ap_style_dateline_state_abbreviations.pdf
    • https://uploads.strikinglycdn.com/files/0005b830-cc14-4ab2-b219-1e5ae3e5ac05/what_are_the_six_privacy_principles.pdf
    • https://s3.amazonaws.com/tosevud/gekivakigisugumozajeb.pdf
    • https://s3.amazonaws.com/fedufiporara/taiwan_vpn_private_apk.pdf
    • https://s3.amazonaws.com/limepusotanal/53589258130.pdf
    • https://uploads.strikinglycdn.com/files/555f3de7-f65e-480d-b5bc-71bf2a5fa3db/samsung_un65ju6700_manual.pdf
    • https://s3.amazonaws.com/gizonukorad/91503848226.pdf
    • https://s3.amazonaws.com/jefobexapulow/how_to_connect_wireless_mouse_to_ipad_mini_2.pdf
    • https://s3.amazonaws.com/zakunafu/information_security_framework_template.pdf
    • https://uploads.strikinglycdn.com/files/92fb0adb-2ce7-46b0-bb64-2dff602f3e51/descargar_audio_para_aprender_ingles_mientras_duermes_gratis.pdf
    • https://s3.amazonaws.com/wegemebufojafak/makafababorekidusosi.pdf
    • https://s3.amazonaws.com/bokelur/rajizajafemiredozuwi.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_off0000cece.bin
58b1286431acbd29e47992aab784734dec16b00e991e11bc1498c2eaee638894		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCECE 5404 bytes
font_01_sfnt_off0000e158.bin
924d2577633a9837aa254edc2de11b4e5072f5c397d3230e31f0708c006af8a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 10436 bytes

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