Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f2869eecb2f156…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 10:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 53c269eb68cc15c566ef441ce028bb55 SHA-1: 524b94a545817fcdc198a1e9e0481c12408e9c20 SHA-256: 43f2869eecb2f15605d631edbfb6e601a952bbb173ac1d20cb92b057dd8a5817
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://camelcarpet.org/d/files/sisedipekof.pdf In PDF document text
    • http://www.tivafa.hu/upload/file/fupuxuxozikigasotedevevu.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/26004223384.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/xukopuzimolepa.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/jolubapuk.pdfIn PDF document text
    • http://scpt.it/userfiles/files/36555065720.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/28248072713.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/49265489343.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/zonerisokuwez.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/miwagifumowerorunitedores.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/miwajusaniborej.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/7480548547.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/repajixinimuw.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/pafapugef.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/tojevawavoviriguwikaju.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/ruziparuxiwonoxeti.pdfIn PDF document text
    • http://all-premium.com/user_file/files/rewuditugisudimulapiv.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/berizivax.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/palofowiboluzesi.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/66524612329.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/95356305449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=screen+recorder+not+recording+audio+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_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 10508 bytes
SHA-256: 38f8152845f9fcf1ccc0d7317027c54061d0fa0124b41b5c6af0bc79e7cfa96e
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 18252 bytes
SHA-256: 9b450a501bc9a2b1a33a6a85fd0b1e39b5ff3a1158ad4f3f262c69ced5b5faa1

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