Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64ef7d1fb2f9821…

MALICIOUS

PDF

94.6 KB Created: 2021-03-01 09:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0f9146a05e70399ec1a80d8aa13bd53e SHA-1: 38dcc4c44ff912065e572dfd51126ed709017205 SHA-256: d64ef7d1fb2f98217a34c2822fcda6c3d948f2b15f8e9c297282c2ce8c5287a8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, indicative of a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the document's primary purpose is to drive traffic to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=korean+from+zero+review PDF link annotation
    • http://funapuz.iblogger.org/zubosexig.pdfIn PDF document text
    • http://piziguto.iblogger.org/54750431402.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/hcjgijS/mogubewijupa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369764/normal_5fce9b60c71a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496380/normal_60305bbb3c9cc.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/sabur_xodebiserisago_degetuda_kigexuduxekazev.pdfIn PDF document text
    • http://juladolagu.iblogger.org/39566736389.pdfIn PDF document text
    • https://rarikomedos.weebly.com/uploads/1/3/4/6/134616559/fegufupimetaru.pdfIn PDF document text
    • https://volasetabis.weebly.com/uploads/1/3/4/8/134879514/6114365.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379233/normal_5feff0910893a.pdfIn PDF document text
    • https://cdn.sqhk.co/jigixomavola/qAgibk5/kezelusoraravanir.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/b4be4f4f5d696a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_600a7876be459.pdfIn PDF document text
    • https://cdn.sqhk.co/kulukopupiw/diXVZRy/56795318028.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/6gjAKft/doom_eternal_soundtrack_itunes.pdfIn PDF document text
    • http://masovizifuzaro.iblogger.org/12390834863.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vomusisoz.epizy.com/apple_airport_express_base_station_as_wifi_extender.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/puvorivutoduwo.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/78496576429.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/zodipenobes.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/98946521983.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/char_broil_bbq_cover_6_burner.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/6856271191.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/buffy_eucalyptus_sheets_review.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/clinical_examination_of_farm_animals_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/java_ee_eclipse_oxygen.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_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 3860 bytes
SHA-256: 02694eb167231e497d0bd463762e748947b29fca1207c16aa3abef65f625d14d
font_01_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 4872 bytes
SHA-256: 89734d9e84c2f89bab93843ddda13801b72c79350db73fda06b63aab6faade55
font_02_sfnt_off00012bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 11792 bytes
SHA-256: 3382edbb403c09c7677e7b2ba2606a89e58f3c82cf810a32e4ca5759a1f2f5fd
font_03_sfnt_off000153ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CE 16544 bytes
SHA-256: 3f4af96d104d6a6379d65ebf1b9c1df32ecd9a79e0db2cb35d588cbb132ad8e2