Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f55cfc75e31d7db…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 01:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3474c0268fde9e9e038c7d1ca3adef03 SHA-1: 314101d3ce1499daab1922b198ced21d95a6f632 SHA-256: 5f55cfc75e31d7db59d4c61164185ff40b9532a348bc993f790b01aa5259b92d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to distribute malicious content or phish for information. The embedded JavaScript is likely responsible for initiating the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coevent.ru/upload/files/17723978422.pdf In PDF document text
    • http://tantos.jp/js/upload/files/zobupap.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93479a3ac---39312892997.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/zimulujitojoku.pdfIn PDF document text
    • http://clingac.es/d/files/96039511547.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210901152626.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/72929599203.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/zulirapivivajesanukuji.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/zupizajofetal.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/pomubedoginotomug.pdfIn PDF document text
    • http://deauville.ru/files/file/tobomi.pdfIn PDF document text
    • https://loyd.rs/images/file/77591016951.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/33213271897.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/65126730018.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/suxejam.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/rebesosulunarutitu.pdfIn PDF document text
    • http://net-work.cz/data/file/92023131729.pdfIn PDF document text
    • http://hueide.com/upload/files/wutaxurowuxoxo.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210912225055_son62d.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/sazusamirirut.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/fiximuzeme.pdfIn PDF document text
    • http://zerosquareonline.com/file/49979575915.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/53696335072.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109171535104231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=datemyage+mod+apkPDF 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_off0000d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 18696 bytes
SHA-256: 9934527c448344d6739c333a942d0bc0127b121ee479c22af4a66676201e5067
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 10432 bytes
SHA-256: 63c1e99e2d156f919161750015c8231808dc6c796fc1193f0342af6fbf5fb44c

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