Malicious PDF — malware analysis report

Static analysis result for SHA-256 571503e9710d13bc…

MALICIOUS

PDF

71.5 KB Created: 2021-09-18 07:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 50154ef3c5a025bb800d2c0388173fa4 SHA-1: 5ed66d08cf74594189c95eac7925b0749d44ecc9 SHA-256: 571503e9710d13bc42a4a9cec60484c6c2de336e655cd68cb392af2a8d0ba6b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The document body is unreadable, but the presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the primary purpose is to redirect users to potentially malicious websites. The sample likely exploits a PDF vulnerability to achieve initial execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/960056376.pdf In PDF document text
    • http://ljsmelt.com/upload/files/76946183957.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210910023026.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/reguzavurinupaxo.pdfIn PDF document text
    • http://atek-ent.com/upload/file/28705930880.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/79930296271.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5e0c1e7---3480198787.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/daxedu.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/jazibawapamef.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/33291857251.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/fewovuxapinixalise.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/puvozifomizaxezadore.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/79170262127.pdfIn PDF document text
    • http://capital96.com/userfiles/file/46106146062.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/junesu.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/ronafanolawefawezodibopiw.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/21483150861.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/84313864933.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/46688774486.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/48544176124.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/nuhdhtj35a20kf0cddua8anekq/zukijiwamebepiwoxitu.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/wupusujoxokuwaxosagu.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/50483000752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=clasificacion+de+los+aminoacidos+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF49 10612 bytes
SHA-256: c69a8ec87e08b143e12b3b12265e156ee4d1b16121e29167d68271b9e467f1b3
font_02_sfnt_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 16480 bytes
SHA-256: 4e687b9156947ce9f243bbf02dbbb87260674ba97bd55d57bff06efb7ea7f7a3

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