Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b93c35bad7eaba2…

MALICIOUS

PDF

79.0 KB Created: 2021-09-11 02:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 960c6ca865344994e45a1593a528974d SHA-1: e6039d180e2fb4681a3da6fa668a33b9b44408c8 SHA-256: 0b93c35bad7eaba2cd55fd957f879f7966249a803f03289666bf3e97bf441692
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7019

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://mamalight.net/business_school/uploads/file/xijokuxulegivorutipi.pdf In PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/nirinimowefivekirifogilej.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/37704565776.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/66713880589.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/64344697831.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/94833339876.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/dowotugokuwini.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/8858428608.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/28265001000.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/roselarumoraloguga.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/9036196041.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134c66cc2148---folusovesunowax.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/tefef.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/44302598320.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/pajiv.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/juguke.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/tadukasewapibijerogepulem.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/93211708641.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210903062428.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/53895433626.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/59210292332.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/12967349180.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1fd4aaac---buvut.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/99159604885.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/nimosubusajumabuvifijof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=concise+pharmacology+book+pdfPDF link annotation
    • 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_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 17116 bytes
SHA-256: 214f8c78cef3569d5c7b431ca4bc70b0821e3a21fb693b6949a70f1b4185cd43
font_01_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 11344 bytes
SHA-256: 52a4f2e2ee9a29b07f50664adbc885064c961430089e7a6cdad5c0a9e1ad80a3

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