Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d35ea6974f04d0b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 04:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03e8994960c8c9eb2bfde91149c4b6bd SHA-1: 955f2886a3c8c49265a655d4f390684a9bd66807 SHA-256: 6d35ea6974f04d0b11fe7ad54917d0fcb8ab64346eaa056728e510d01aeafaed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://onlytech-tunisie.com/userfiles/file/66024648032.pdf In PDF document text
    • http://watfordfairtrade.org/app/webroot/img/files/kavujajadominibosetat.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/govibijiporo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b0d68b45dc00a3b12015af66fc32edcb/3214078932.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/luzilanezo.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/63377998267.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/zapikon.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac189e1ebf---xowakejobemafilidiw.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/fezonenu.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210908224820321.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/dolapiteraraxaxolimelut.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/57479181620.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/sevifimodapoluxerimase.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/pulesafo.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/porozisezasiwatafeka.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/vorivawokanefodonafanafak.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/79087397309.pdfIn PDF document text
    • http://med-os.com/user_upload/file/befuxijolu.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/berajesefusekepobiliga.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/bosaxosuziferiduweturito.pdfIn PDF document text
    • http://marketingnews.fr/images/file/49588739448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=apn+tuenti+androidPDF 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_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 10252 bytes
SHA-256: 2684c34a55d37d8305e659b37ade9a8068fdc20e1993e526e34ed9ca46188af5
font_02_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 18660 bytes
SHA-256: 584735c85d6c7ffcce1e4650442c92d2e8079bca8219235bc64c41ea8bb56a58

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