Malicious PDF — malware analysis report

Static analysis result for SHA-256 e335ff44c75dea78…

MALICIOUS

PDF

84.5 KB Created: 2021-03-14 04:38:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 462d692abef08ed404717f6220363c83 SHA-1: 7d3b7c05afd8c7dd719fb0f9c0a78736fa1fbb27 SHA-256: e335ff44c75dea789a20800e800913d33ecdaec2b0a2b641a80a0fafbc3b2849
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM' that points to a large number of external PDF links. The primary URL, 'https://vilenefex.ru/wix?keyword=sigma+release+date+overwatch+console', suggests a tactic of using search-related keywords to attract users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted, but the extensive linking and phishing detection point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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=sigma+release+date+overwatch+console PDF link annotation
    • http://zimezobot.getenjoyment.net/what_battery_does_my_g_shock_use.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420431/normal_5fe40ee95d797.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/5L1jdif/heroine_mascara_remover.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/bifironojebovepupomigal.pdfIn PDF document text
    • https://zagiwesojuju.weebly.com/uploads/1/3/2/7/132712322/gunatere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_5fdab7b8d8ce7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418984/normal_5ff713bac035e.pdfIn PDF document text
    • https://gezajinesobovu.weebly.com/uploads/1/3/2/3/132303035/kopurariragagisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_602c96b8c0e52.pdfIn PDF document text
    • https://cdn.sqhk.co/zotevokep/fii8phj/pixel_swordfish_io_youtube.pdfIn PDF document text
    • https://gepemizuwawufak.weebly.com/uploads/1/3/4/3/134335313/e6fcc6b4970c22b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408853/normal_60045dd91c1d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5fd095e92088e.pdfIn PDF document text
    • https://toginomaba.weebly.com/uploads/1/3/4/0/134042469/4ce8a24e1d9.pdfIn PDF document text
    • https://cdn.sqhk.co/nisikevepoxi/hd3hraM/youtube_sound_booster_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411512/normal_5ffddff2533c9.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://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_410ded766a3643e7b3650649b315f7e1.pdf?index=trueIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_c50d14b5751447a7af245d5dd11d9124.pdf?index=trueIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_473c462eec774d00b2cf59aecf282a40.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_a89389da656c49b4955457207a21cfde.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 5396 bytes
SHA-256: 69ca8335b922b57b295eb462bc94cbbb4ba599bb919f8ba240c5ce0be5a552e4
font_01_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 11480 bytes
SHA-256: 2e1c9877decaf7c6270828f7983b8d7452def786c5637e335133b15841a4ef56
font_02_sfnt_off000134c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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