Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0355fa0b3a26b1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 11:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1662d8add0b350d92b1574d1918c23d2 SHA-1: a3948c70cd02be6fad46ec2ba469c24e20a4d6f2 SHA-256: 7a0355fa0b3a26b1b78ca575c68562e1fcdf73038da52452121690aeb442484a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a phishing or malware distribution lure. The presence of embedded JavaScript (T1059.007) and a large number of external URLs, many of which are hosted on disposable domains, strongly suggests an attempt to redirect users to malicious content. The PDF structure and numerous links indicate a potential spearphishing attachment (T1566.001) designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier clean score 0.2133

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=good+app+for+reading+manga PDF link annotation
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131098b6041b---27878522938.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/pivalefamisipu.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/53347851780.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/84430675534.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/dunoko.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/60500679102.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/64228415876.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/38386824060.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/78643962386.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/siwikatenajugagudoruke.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/fcceb452373813dbe7b1787b88cab889/58067953522.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161350d81c95fe---difefimulero.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/metalituzavuxifekutibe.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/fakirinaseravapuw.pdfIn PDF document text
    • https://blugarden.eu/file/zamozeponawe.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210902201633153775cylz27fxft4a.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/nununufefive.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/70726402625.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/31152741724.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/37161222806.pdfIn PDF document text
    • http://beijingteye.com/upload/files/24293949134.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/wakazowodexurozupufe.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/fakulikebulikizude.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/4416013068.pdfIn 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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 10568 bytes
SHA-256: d8a57c5593096912aaeb87c561bdd91b10ebeee62db389b545b0980f65775956
font_01_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 17324 bytes
SHA-256: 7406482f6cc37633eae1a0b4715a7627a9229773fb0f67588c6d45b401614b1d
font_02_sfnt_off000132fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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