Malicious PDF — malware analysis report

Static analysis result for SHA-256 208a2c1f106b1708…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 14:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 08a8d8c93ee406755aa168f6d676d5d8 SHA-1: 90b3933246556ee5240d9fbbbea10e1188122856 SHA-256: 208a2c1f106b1708371e6e83cc111ef09fc0f65199535d3bd434863a60ee05cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for a large number of links, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://rowadalbyt.com/userfiles/files/10910296673.pdf In PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/botimademuvoro.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/tolov.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/ridosujinetuzepofakijizo.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/8071432858.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/vawudutapetalowotumi.pdfIn PDF document text
    • http://cobmedia.hu/include/lazilepikok.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/nozonilawigunaba.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/sutujonigegidasiwazurupe.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/31839650605.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021912537244849.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90997455022.pdfIn PDF document text
    • https://evenements.gipso.org/ckfinder/userfiles/files/55665044098.pdfIn PDF document text
    • https://asiapharma.la/files/files/57092698326.pdfIn PDF document text
    • https://bor-diing.com/upload/files/daxarodemazaneleselegi.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/29113731.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/69883496476.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210909071307.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152dc41c73a3---18087279881.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/gatibobijatu.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/80814413829.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/92712511325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+fix+sd+card+corrupted+on+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_off0000b289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB289 17164 bytes
SHA-256: 9f592a83e6ff4330232b92de27dcaebe50120756b0d46612f84964fe35ab743b
font_01_sfnt_off0000dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 10848 bytes
SHA-256: 0b313a230ca245430ac6852f42e3774cbfe3907f8a3a62a6865ded674d6db57a
font_02_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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