Malicious PDF — malware analysis report

Static analysis result for SHA-256 501d35c4af07d40a…

MALICIOUS

PDF

86.0 KB Created: 2021-09-15 21:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 256738971b3dcdf8bcf146acf3a76857 SHA-1: 929fb57fba4f227165814856b01e54a1108d7feb SHA-256: 501d35c4af07d40aa9b1593f36bb7031f1448e18be1910a19667914dc3e508c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=why+is+my+phone+not+connecting+to+wifi PDF link annotation
    • https://lomasdelaweb.com/userfiles/2008.09/file/54847829869.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/nidoj.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/21059601842.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109061712316117.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/1703446493.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c5077a8d234da418d3c95c994e872578/59589684698.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/bufulevoxu.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/wifuvepade.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/pavamezopeg.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/36175157755.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/nujegaliwi.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/46958284831.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/29912557349.pdfIn PDF document text
    • https://webrobogo.hu/kepek/jigole.pdfIn PDF document text
    • http://i-physiology.ru/upload/57590718589.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/rifozax.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210914_070907_103.pdfIn PDF document text
    • http://tzsunup.com/upload/giwanoxap.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/90652910486.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/nadifamoguxovalalutom.pdfIn PDF document text
    • https://teamcode.net/upload/files/xakeparevemuwu.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/41376868166.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/gofog.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140082c91a1b---namelabafakex.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/jomudoje.pdfIn PDF document text
    • 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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 10812 bytes
SHA-256: d7cce7c1fd123fc8ead148d4252e86a0cb820d3578d52d0dbaf49be6cce9b988
font_02_sfnt_off00011ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 18052 bytes
SHA-256: ebe2604132a2227154830df68f1dc772de010166c549dcaea74224b52f5dabb2

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