Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb503ab6105532f0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 12:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3478cd7737a04c3b8631ccaf7f947108 SHA-1: 0763a95d4854af934a53d217490f75d31365c292 SHA-256: bb503ab6105532f00160169a7d35ae4d101a869fe5ec022ef0e360a2b987a573
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the links. While no scripts were directly extracted, the structure suggests an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=pimsleur+free+apk PDF link annotation
    • http://www.urbanwaterways.info/files/62714134340.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/jasamusifajigatul.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/42478889292.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/tizutonabuforirovu.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/jixawarigenuxebixufu.pdfIn PDF document text
    • http://innotack.com/userfiles/files/xuzudulenuxibug.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/wowerun.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/60486660326.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/16058503645.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/1755085033.pdfIn PDF document text
    • https://vitanov.rs/files/lakixegomelilidonuguve.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/7515297456.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210909203553_wf631g.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/kivufujewo.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/450264008.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/63229006281.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/39875219319.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/61659230587.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161354941d3996---238444440.pdfIn PDF document text
    • http://methese.com/upload/files/nejejapumizi.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/temokebopome.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/xurixifaruwajuretoxufetap.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/11430299638.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/7990150047.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/8099731257.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_off0000d4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BD 17872 bytes
SHA-256: 2eca9e25843b11c07620b1d6b6aefa817d6fca264f5f04e6983a15337df48b18
font_01_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 10392 bytes
SHA-256: 34c575c339735c9fad08f60b0a085a03aee55739a70783bfedf9abb85fe3ebe8

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