Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad63149742c20fb…

MALICIOUS

PDF

91.9 KB Created: 2021-03-24 01:28:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69684fdf972e971ada01183215377fc1 SHA-1: 7477016f76b1be1c0d630bcadd33cf4a74abc86f SHA-256: 7ad63149742c20fb0fd2c015bdd96a6bf1708f145f62fba7fc1050012ca63651
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or redirection tactic. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure itself is used to host numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=format+html+file+in+vscode
    • https://cdn-cms.f-static.net/uploads/4421062/normal_5fd796648f8e7.pdf
    • https://cdn-cms.f-static.net/uploads/4404524/normal_6048243c5d2bd.pdf
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5fc7cea63be74.pdf
    • https://vigoruso.weebly.com/uploads/1/3/4/1/134131386/23f17.pdf
    • https://static.s123-cdn-static.com/uploads/4462681/normal_5ff021ff624f7.pdf
    • https://cdn-cms.f-static.net/uploads/4475392/normal_603c5e7f54753.pdf
    • https://static.s123-cdn-static.com/uploads/4367007/normal_5febd163a9846.pdf
    • https://jiwosanoxonu.weebly.com/uploads/1/3/5/2/135299962/mulodupejaxa-vuxete-migemawati.pdf
    • https://zumugewij.weebly.com/uploads/1/3/1/4/131483128/3179027.pdf
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5ff714a286ae0.pdf
    • https://cdn-cms.f-static.net/uploads/4456984/normal_602c155059554.pdf
    • https://purabadixubemik.weebly.com/uploads/1/3/5/3/135399060/dcfdb9.pdf
    • https://cdn-cms.f-static.net/uploads/4409840/normal_6045bca23d4f9.pdf
    • https://golizagizaziw.weebly.com/uploads/1/3/4/7/134701046/8309854.pdf
    • https://finudekenituw.weebly.com/uploads/1/3/6/0/136053274/485413.pdf
    • https://zinaxavum.weebly.com/uploads/1/3/4/3/134354277/278596.pdf
    • https://cdn-cms.f-static.net/uploads/4365552/normal_60541e61d6f0b.pdf
    • https://rimidewazasi.weebly.com/uploads/1/3/4/3/134317879/c44bf85.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/45b5bfce-8116-4e68-86d3-9426ad45755b/prepositional_phrases_worksheets_for_4th_grade.pdf
    • https://uploads.strikinglycdn.com/files/537b0f17-a46c-4b5f-81ac-1aaea7b1fb46/62499970168.pdf
    • https://s3.amazonaws.com/laginekux/mogol.pdf
    • https://s3.amazonaws.com/lebaxa/33977677706.pdf
    • https://s3.amazonaws.com/mosezavor/critical_thinking_in_nursing_process.pdf
    • https://uploads.strikinglycdn.com/files/f1797a4c-3f6f-46ec-9341-ef81c27321b8/shoprider_deluxe_mobility_scooter_spares.pdf
    • https://s3.amazonaws.com/fadupazageraf/ok_google_weather_report_for_today.pdf
    • https://uploads.strikinglycdn.com/files/db998719-d84a-4239-98a7-affc66244f65/32597113857.pdf
    • https://s3.amazonaws.com/tezofuretejom/targeting_mathematics_5b_workbook_answers.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ef.bin
cbb52481ce94e16f1aa7c1e5556943e0858c32639ae52c58d7d3596933ba349e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 3016 bytes
font_01_sfnt_off000101ab.bin
04bdb86fde2d509e098f34872a3519cb1088b03454c251a5fc44e3fa9c155cb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 5276 bytes
font_02_sfnt_off0001136e.bin
362fcc8c0e065bfe94fe7c26d093937d52c871b5a319c16f3bc9ab408ef25236		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 3056 bytes
font_03_sfnt_off00012008.bin
803350ea71b14956aa8f467b6b1d85018b0cf22cacc21e968e346eb8d0f408c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 11548 bytes
font_04_sfnt_off000147b0.bin
bc51589f4126070157d941dc70f4aaa62f87a1ee89c70ad785bc871a178231d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147B0 17524 bytes

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