Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cf7afe4952a244…

MALICIOUS

PDF

87.7 KB Created: 2021-09-11 01:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d36ba2d8f052327d9e985b32859ed7ce SHA-1: 77765006270b112990f4a4c095f9b2cb643308d8 SHA-256: 12cf7afe4952a244b7de4936df5a78601445bab45f903687677018cf659d30f7
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm on disposable hosting, suggesting a tactic to manipulate search engine results or distribute malicious files. Numerous unknown URLs were extracted, pointing to a large collection of PDFs hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4cab32a0bebd99f2a21cac2550914e91/47803453807.pdf In PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/56026197512.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/vuwavekutezinadajilirif.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/6184794536.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/sidupegixoninelijudolido.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/vujapabakuv.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/70739002977.pdfIn PDF document text
    • http://brenderup.ro/mm/file/96920444021.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/4994942032.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/bimimakunome.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/30720715580.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/luriko.pdfIn PDF document text
    • https://efnnma.org/files/file/83664938533.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/49489781904.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/15518250232.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/55418566535.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109100423019197.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/75682795528.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/88106373839.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/64575787660.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382819b16c6---xemasenetukagutunuse.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/41248354427.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-04/images/files/tokesadolatafuvixozukax.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/50631822406.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/14827620299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=zombie+shooter+gamePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 17988 bytes
SHA-256: 24a07b74ee957d6e4a09bf16dd0d553a11b63e28b383b6753734c9134fe8a123
font_02_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 17460 bytes
SHA-256: 3885945afce8d6bc91259a11f38e7ab57b229358ebffaecae11d58787ef53ee8
font_03_sfnt_off000138fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FA 10508 bytes
SHA-256: 8a84e89b032139c57a66762ce4a521257bb5ef8aa09712929fb4283d703112a0