Malicious PDF — malware analysis report

Static analysis result for SHA-256 2358ccd983b7c240…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 19:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8318a453f4fbb92aa71faa2a3e413388 SHA-1: db18e0820b210f3bca1ebed36b8c4aa7bae201b3 SHA-256: 2358ccd983b7c240d5a0c8d8bc43d4d57b2041114bbd7df861e4d3902e3f2d54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, suggesting an attempt to obscure the true destination or distribute a payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to trick users into clicking through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://myphi.biz/nbloom/fckuploads/file/40153535453.pdf In PDF document text
    • http://fiumevivo.it/userfiles/files/39998534663.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/75285676120.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/13638406680.pdfIn PDF document text
    • http://araratmebel.ru/img/file/bazuziwatobikumidow.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/8943425620.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/selipenuparijidelipa.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210909015220.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318fd44e78f---61473554401.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/25476402785.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/15881114676.pdfIn PDF document text
    • http://talesma.com/E/file/livoduk.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/kiwijet.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/fidulilixogadaguwunuw.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/60874264783.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/serokonafimamuzixafe.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/wozimuradavak.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/45737547614.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/4502101660.pdfIn PDF document text
    • http://badgerhillfarm.uk/69451512133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=plants+vs+zombies+unlimitedPDF 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_off0000c194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC194 10676 bytes
SHA-256: de354491f18183f3347417602a35cad51946ef9a9cf72d45fc26cd34e91dc147
font_01_sfnt_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 16876 bytes
SHA-256: ec5449a29d8d2ceebd8a4af49ba30b63a683976fc3ac6b5ae3ec47f0b11b5487

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