Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e350794f2c8c96…

MALICIOUS

PDF

75.1 KB Created: 2021-09-21 01:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2833a9d20b118c46a50351116835622 SHA-1: 3f79e05b1645418d03bcf24c1953b81f8052242f SHA-256: 15e350794f2c8c964b9cc7b1a62ebac824a3d9519837c60aac7d3a388bdc7eb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding a large number of URLs, likely to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://targhevaticane.it/userfiles/files/zabavinepinujemexufi.pdf In PDF document text
    • http://csp.hu/editor_up/gizexapafavirusij.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/20045765901.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/kajowatiziwa.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/34427449562.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/viwejotu.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///79301106785.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/mojumilowexojoduwowesogox.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ceb8e23e---mamubamabutupibodawem.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/pomavepunas.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/givofebajovoxuf.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/88965740690.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/96458920885.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/gixidixuxozebesitum.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/61690416412.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/17179308323.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/35466200883.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/zijubavawuzekaxasaguvazes.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/11459610453.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e56ec5b23---jatedewubafunorototi.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/79832017015.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/39175590542.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/jomabozusif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=3+adjectives+that+start+with+the+letter+wPDF 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_off0000c1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D2 17268 bytes
SHA-256: eb89df6a5b414f83ccfa762123a9046a67b85d427e66718671c2c971158d56d9
font_01_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 10600 bytes
SHA-256: 4c8958099ee1ae13198c03903467aa46049f95bb55748561fda2cfbe63a13702

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