Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1953524cc1d456…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 09:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9bc88037b9591f4da41f1797e993c2a5 SHA-1: cc90f018cd4f9cd1538d093207b049a7babc18b1 SHA-256: 0c1953524cc1d456080009592099aa543d4a0ba1e1b092db070171aba180b7f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely part of a scheme to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161322ed7c7810---zenunulev.pdf In PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/rapisuvedefawedo.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/82863336791.pdfIn PDF document text
    • http://kmsenior.org/file/files/limujuloxupo.pdfIn PDF document text
    • https://coluer.ir/documents/file/91862682945.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/80483398047.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/93113501860.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/lojisobepam.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/98524328203.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/47779816550.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/tifepupiwasuwakiro.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/jizixokadexal.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/95971760732.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/buvasedumupuporebusokegi.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/jujanuvutisovonesetun.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/34fd64aa4241465d6af03cc6f64bda6d/59012075811.pdfIn PDF document text
    • http://12shio5.com/contents/files/kekolelumuxapidixewoles.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28984675858.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/90940254314.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/20327005707.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///55715394434.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210913035334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=city+of+stars+piano+sheet+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC224 10696 bytes
SHA-256: 4eb7af02799f08e36d1e720ddffcaca2014783e2b57a0492fc2563692bf1e92a
font_01_sfnt_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 17088 bytes
SHA-256: 1c130d98358555163ac6aca8904422863ef66d05fe29a5d1d8e1973aa0053718
font_02_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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