Malicious PDF — malware analysis report

Static analysis result for SHA-256 796ca87fb8fcb48f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-14 06:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1df998d4cdcca18049862aef95d7f39e SHA-1: 8fdeaf7e5f5085c59a90b185d01b5d58d146d4a2 SHA-256: 796ca87fb8fcb48fc8b133f0ee3138d16651eab102c1f9989cecb2f6cb8b63b0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially malicious content. The PDF structure and embedded URIs suggest an attempt to redirect users to external sites, likely for phishing or malware delivery. No scripts were extracted, but the presence of many external links indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3255

Heuristics 4

  • 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
  • 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://studioriboldi.eu/userfiles/files/mipediwuriwuzaxomukusek.pdf In PDF document text
    • https://agronlogistics.com/userfiles/files/zilajigikujuni.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/zawamov.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/vubejira.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091213590936.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/20952837117.pdfIn PDF document text
    • http://15881588.com/ckupload/files/tajotarifogepasagazigukas.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/nebabenok.pdfIn PDF document text
    • http://unityproductions.com/upload/files/titojomaxidajakugatekaje.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/70895851469.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/gakiwoli.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/38397780645.pdfIn PDF document text
    • http://voijin.com/userfiles/files/mofij.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/54908471576.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/28758334964.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/89756574551.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/68547652387.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/raweloxelelojewa.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210904092338774.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210913_5D81E847C2A5816C.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/94487792101.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/98666020160.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/52413055076.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/nomilofo.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/64126530249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=men%27s+day+2019PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12581 17408 bytes
SHA-256: eb3f753bf269804e236439cd14bab732d90fc79e6fa53dfa422b36047afea7e8