Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf2abbe337d090d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 19:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8e977d819382e66d84d1e75abe5f76d SHA-1: a50bb152f6139499e0f37bc15de36493dfa055e5 SHA-256: 9bf2abbe337d090df8e2bbb5a74310c56dec5c94a718449704713919e7cb684a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for links. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://silverk.ru/img/lib/file/roxel.pdf In PDF document text
    • http://ntep2008.com/UserFiles/File/xatuzab.pdfIn PDF document text
    • https://fivetc.net/uploads/files/12349566071.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa67e6c2fa---rodapuwetiwukekodenijul.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/fufijomelemoras.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/46576379826.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/24263573565.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/61600914834.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/xakutanizimelukadoweraji.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109121503378590.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/66561127084.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/xewife.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/14840841152.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/dugaximivurubu.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/81152638281.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/solenob.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/14203718996.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/34222258091.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109052313121734.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/tovazewamemiron.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1050623357613c2278bac0d.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/dadaguxuwuzata.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/35169530250.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/puwutivenufeguforepaxemag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hikvision+dvr+application+for+androidPDF 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_off0000c8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B7 19900 bytes
SHA-256: 3c1356149295ffcee67e322316cc5e4b7a4112b810fd79b9b898c6fecc7b949a
font_01_sfnt_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 10628 bytes
SHA-256: 3907af9850c31215fbd8668ac04b2652b0d52d161cf8cc744f1e6df11d2b7564
font_02_sfnt_off00011511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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