Malicious PDF — malware analysis report

Static analysis result for SHA-256 3851212aa7d965e2…

MALICIOUS

PDF

101.1 KB Created: 2021-09-12 22:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e76be70365976d79cbc38883bde6d756 SHA-1: b235b5a4ab50e70bdc49e5071a383732697d0052 SHA-256: 3851212aa7d965e2e48f6c073c7ad665e8ae7d8ee8a8d36ca626a48f8edc38a3
146 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. Heuristics suggest it functions as a link farm and a callback phishing lure, directing users to potentially harmful URLs. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://sarica.com.tr/ckfinder/userfiles/files/28278577840.pdf In PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/3231686708.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/sojedovuridimiriw.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/fisolagupagidojet.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/gapirenabilopuga.pdfIn PDF document text
    • http://weldingplaza.com/files/file/28705440326.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/69755891086.pdfIn PDF document text
    • http://synphabase.ch/upload/file/21750441128.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210912_153311.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/mepamuvitapeve.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/20451002287.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/33135486601.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/74215784650.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137442b25266---88651218415.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/ridifanofarafituvigobadu.pdfIn PDF document text
    • http://stroi-sistema.ru/img/17883461157.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/97969556754.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/28377991966.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sogubetepinikivepija.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/jujibenudibezuwan.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/fabuwukafidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=boot+manager+apkPDF 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_off000123b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 10432 bytes
SHA-256: c0e47f09645c2435d9f7d4e74b857e6d8d613672d5213e64d50f4eee1395f6f5
font_01_sfnt_off00013b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B64 19276 bytes
SHA-256: a9c0815bec59c2c4f0f1a8c94fe1904d8cf2e7c11cfe2ab409d053c3c7d810cf
font_02_sfnt_off00016e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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