Malicious PDF — malware analysis report

Static analysis result for SHA-256 0491f3c659a81905…

MALICIOUS

PDF

76.4 KB Created: 2021-09-21 09:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed01806d3268fa44351d5093b830de8a SHA-1: c181910be729e0d5da079f5f3bf0637c41c08692 SHA-256: 0491f3c659a81905084c30660e618f65e567967db28999fdb7b201ee97b1f4f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/wozobotitirapuxazemisef.pdf In PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/90319823152.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/67357731429.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/96639147700.pdfIn PDF document text
    • http://rivucota.com/upload/files/29959643685.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/91981515648.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/7942172471.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7frmp45f7hcd8drelv12p99rv8/putonufutepolodap.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/406960908.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/4376933372.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/vitiji.pdfIn PDF document text
    • http://stl-hk.net/userfiles/28235692074.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/titasudiwikumowe.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/84673467080.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/tavafutuwugakifasesidolol.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/jemaliri.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/figezad.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/witivelom.pdfIn PDF document text
    • https://emenu.hu/editor_up/wurifedojagidiwanoko.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/zesaxu.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/67437319977.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/36811793060.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/4476572953.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/72572188382.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/7273566994.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/35191294471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=redmi+9a+free+fire+testPDF 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_off0000c3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 10456 bytes
SHA-256: 72962c8a187d3387a60557210ad0040c92c562160a5b999ed56cfa6c92d94faa
font_02_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 18676 bytes
SHA-256: 74761a6e63d06a90bcddd99935991217d119dc49b3828688af5781b9902073c9