Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd76eeb3fdb85bd0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 03:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b08eb594151cddc8b7c4bc4a0db4a418 SHA-1: 06a2db7f37b286bed01fa60b4a6e3ca26f7d0ee2 SHA-256: cd76eeb3fdb85bd0b1f56680d4fcf55e068cbdaf2e7449d09b21c449ad93330e
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting a tactic to obscure malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://spartaksedlec.cz/spartaksedlec/userfiles/file/13712448774.pdf In PDF document text
    • http://nfc.soo.jp/file/51667257395.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/lokijevut.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/tesazaxojewokumavuril.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/1335859119.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/48721075573.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdda099dad---90931787918.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/sozafadafij.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/matazubobugu.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210909_164728_166.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/65066577060.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/puzolilamakunisumubus.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/70332187045.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161303afb436f0---14789951890.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/54920100762.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/59626349257.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210902014034.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/zejuxaluditetixokavos.pdfIn PDF document text
    • http://grafitym.kz/files/file/36549312179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+power+amp+full+versionPDF 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_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 17712 bytes
SHA-256: db40bf2a8cc7921d646bae36bae7d1a2543523c4fc09d00ee5137b3591016893
font_02_sfnt_off000122c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 10816 bytes
SHA-256: 91105385ccd5ec0b1c00d0a6de350772a341ec8e7f310991bf2ea76176959f42

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