Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c502d12a6fd602c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 17:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9576d6030342a21d018e17d3b4c1afa SHA-1: b89f1e52d55a6b13f4f019fa88d19648d5c092cc SHA-256: 5c502d12a6fd602cbf18ecb0479288dd67a618f1266fb0844d6a82f7fe9104cf
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URIs suggests the document's primary purpose is to redirect users to potentially harmful websites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://irlanc.ru/uplcv?utm_term=android+automatisch+mit+wlan+verbinden+wenn+in+reichweite PDF link annotation
    • http://roberlo.cz/www/files/file/xududobagujusikujawusino.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/9359873831.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/sejizorazisedeseduwopax.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/falatujilev.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/nujudabukosazirosivomoxom.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/34898457373.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/gebizetufuwotamuxodemafi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613edd196dde8---1028261597.pdfIn PDF document text
    • http://ombs.ru/uploads/files/58738177857.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/nopasovol.pdfIn PDF document text
    • https://vpmemorial.net/images/file/843064403.pdfIn PDF document text
    • http://szwygs.com/upload/29496025519.pdfIn PDF document text
    • https://jjpremiers.com/files/1050390582.pdfIn PDF document text
    • https://atavio.ru/files/file/lomafukovonozit.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/zadopepekojironar.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/kovigab.pdfIn PDF document text
    • http://wwstationery.com/files/file/loxozajelidatamubogurazer.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/37885578579.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/54983394577.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/nogumowinesepobedadolaxo.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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 11008 bytes
SHA-256: a14f0f7935b1c19476e430806068419b3e00944fd4031efce537dc55eca0e534
font_02_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 20776 bytes
SHA-256: 8ccae0c7c63638ddeacffb3921ab78eb38058a4499335f2b174b19dc01bd312c

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