Malicious PDF — malware analysis report

Static analysis result for SHA-256 a319704b8f4700af…

MALICIOUS

PDF

69.4 KB Created: 2021-09-15 18:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8a92c77163e422ab141d04b6be1fb4e SHA-1: e77881a26e26107601f932fa4fa441fa18366725 SHA-256: a319704b8f4700af5cc4ba09889a50821634526f319b5a32d28ce60248752e6b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for a link farm, indicating malicious intent. The numerous external URLs suggest an attempt to redirect the user to potentially malicious sites for phishing or further payload delivery. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vongtaytramhuong.vn/upload/files/54428646466.pdf In PDF document text
    • http://muabannhagiare.net/images/uploads/files/48924494297.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/44967735600.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/64cd086445c209b7a04b805f20747cf0/liseguxotorufesaxuduk.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/29999429753.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/75748836811.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/97430276717.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/31109627648.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/35752518095.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/97139127943.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/40828089783.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210901083221.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/porexemik.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/8857731699.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/99791436996.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/zosawi.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/84095158303.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/67302235314.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/woroxosebotovabonefir.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/95960238668.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/nujus.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/70994514371.pdfIn PDF document text
    • http://mobiliteit.nu/files/ruxividikobupikufamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=go+big+show+season+2PDF 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_off0000b05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05E 15684 bytes
SHA-256: bf9124f9c2184c1fcd6bcd6ed8fa573b093c012fd793ce778773e6864476d5b4
font_01_sfnt_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 10528 bytes
SHA-256: d0fd772b9cc2c2eed55cc1b1958bf8d311b923e7df2294ed96549cb26a2f097e

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