Malicious PDF — malware analysis report

Static analysis result for SHA-256 161aa9ae42581f54…

MALICIOUS

PDF

67.6 KB Created: 2021-09-25 13:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2516ea461beda7bc2a5043cbcb69a35 SHA-1: 50d34532dd7b474fca9c143e63b8dd7608e0a392 SHA-256: 161aa9ae42581f54fa4ab3f67232c1ee09b4edbcc4f753fbc7ce08c4ead39226
66 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 or link farms, indicating a likely phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=how+to+with+john+wilson+online+free PDF link annotation
    • http://solarwindependence.com/ckfinder/userfiles/files/lulotiw.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/lebarufajudugu.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/biwokoxoz.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/jitejalepetowidoxej.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/95461575345.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/wubutegedak.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/gemiravotubaxuniniwonezu.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/12603217300.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96065867937.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/55470814648.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/sedonigifiwivaman.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/romojijamekusisalujinixa.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/47239656430.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/29691148462.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd26c267e---91973781191.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/najazeludinusit.pdfIn PDF document text
    • http://specialcats.nl/media/files/71728823409.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/pazuletifotak.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109110401257596.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/zokenuzelizolodiwow.pdfIn PDF document text
    • http://analhospital.net/file/files/pizan.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d50c9b8b5c---40534343895.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_off0000ac4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45F 14188 bytes
SHA-256: 4f872f621672b2387c3b8b111001b8a3328946c6d1fbbef6744e20904afae905
font_02_sfnt_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 10356 bytes
SHA-256: 2cb541b542abf62276415754854252b3145c243e0c5975a2578deea7630bd425

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