Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e71a6b32bbd165…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 00:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4afd1b1e60a59af3373ee703ca7a9ce SHA-1: 26b93692e233112ccaa0249150f10de1c37ad9b8 SHA-256: 17e71a6b32bbd165e5d846011b071e5547cbba02376b5479f47bc77b56ccc34a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of embedded URLs, many pointing to distinct hosts, characteristic of a link farm designed to obscure the ultimate destination and evade detection. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://moscreen.in/cmsfiles/file/97593780726.pdf In PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/55977100993.pdfIn PDF document text
    • https://citytrafik.nu/images/file/17867422790.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/50580692648.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/89294650147.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/naxuj.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/59264787655.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/26396159857.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/68280205277.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/pipigikizetusevasozug.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/74029712263.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/karigumirumekafula.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/gojiserilefelis.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/45608539294.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/gebawugexoz.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/kudilodusosafisoweki.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/74175188744.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/50276652738.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/23897542913.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/79928282794.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/22861062856.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8na3bihf4sufbf4iaau2o9ka8s/49783011426.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/jasejegelagazotedato.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/16244876577.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/89488963111.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210904_F471BA608508526E.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=followers+tracker+pro+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_off0000b564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB564 10636 bytes
SHA-256: 66fa9d6fce792aac83f6968b0f45e804feb0d79f547bae1d7eb17f13ae3a560c
font_01_sfnt_off0000cde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 16776 bytes
SHA-256: d6c6e67457df0b4456832bbf6daa019c4e352ad3438967ca4647865d75fce515
font_02_sfnt_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1