Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d98bab560c37bf0…

MALICIOUS

PDF

70.0 KB Created: 2021-10-02 10:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2ed3e73fcd98fa8b11731004959d5126 SHA-1: 5e66b9f05230d5645c4f2f56a65c27b507a959d4 SHA-256: 9d98bab560c37bf06869847cc97ce12649ec907e6f032d66b12a953b0f67a307
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of many external URIs suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sloplast.com/userfiles/files/rimafolofu.pdf In PDF document text
    • https://conrays.ru/f/data/dejububopekukor.pdfIn PDF document text
    • http://capri.lt/userfiles/files/43364945272.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/62890703482.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/xirajamozajegaji.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/29765289471.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/98167899762.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/83376534043.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/tetozumogexegoxoruli.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0cl6r0nl3rliesq17kgcsdrg5l/53636468166.pdfIn PDF document text
    • http://pneusmarene.it/images/file/favexelofewagifemujozo.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/8910191041.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/83768352138.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/19420289235.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/jokisirozaw.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/bumelezokolixediregirosu.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/70757998083.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/nepofuximowidoril.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613352044f2cb---5306680741.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/birapululunijimoxomepavu.pdfIn PDF document text
    • http://livestocktool.com/d/files/pasapiwititi.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/depezizupamudoxerixure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=good+compare+and+contrast+topicsPDF 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_off0000af3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3C 10668 bytes
SHA-256: 4b5f7cf8a77e2acabce36936357b474eb4baa25eab12fd2823074b9ed9a90b0c
font_01_sfnt_off0000c7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AB 16912 bytes
SHA-256: 4cd045f5df5cb8f5b56d461af82ff3fd235c0078e18d24e8af5d422cb0cd906a
font_02_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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