Malicious PDF — malware analysis report

Static analysis result for SHA-256 848c7eb4e7a9295b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 13:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df3ca118796e7c43a9af779445f09369 SHA-1: 494178d16aceae21275b5ea15358dab9f3b62e35 SHA-256: 848c7eb4e7a9295b52fad24e9b5d245ea6a4ae473b7c621dc5e03869c3feb274
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spam campaign aimed at driving traffic to potentially malicious sites. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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 https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ca4fa67eb02dfd81907a6477da384153/81457142403.pdf
    • https://gangwontaxi.com/FileData/ckfinder/files/20210926_1CF4B58CBCFB73F2.pdf
    • https://marljivo.hr/UserFiles/files/juxoz.pdf
    • http://beloezoloto.ru/userfiles/file/xosumovelenilubu.pdf
    • http://fioredda.com/userfiles/files/rutodevuji.pdf
    • http://xn--80aamwn.xn--p1ai/userfiles/file/9186584823.pdf
    • http://stepasidemedical.ie/images/uploads/file/94806792924.pdf
    • http://lagostena.it/userfiles/files/61788188625.pdf
    • http://jpind.pl/userfiles/file/14612520719.pdf
    • http://loscogliodifavignana.it/userfiles/files/pazapudusanigigate.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/peratonutitofuluwan.pdf
    • https://bodzlomu.com/userfiles/file/32961188911.pdf
    • http://mackyz7automotive.com/js/upload/files/sadupizumotuko.pdf
    • https://snqrsl.quebec/upload/editor/file/dimered.pdf
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/torubofuzenez.pdf
    • http://worldplastsolution.com/ckfinder/userfiles/files/26279455390.pdf
    • https://senesi-sklad.cz/userfiles/file/wunekagej.pdf
    • https://teater77.nl/userfiles/file/pasesewuxa.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/62892591639.pdf
    • http://stl-hk.net/userfiles/vumezumizekolelufi.pdf
    • http://statsale.com/data/upload/ck/files/fitibo.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161468d32572ad---24099594306.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=san+juan+la+union+zip+code
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEC 16792 bytes
font_01_sfnt_off0000c6fe.bin
e4111e41ad115c9a7d30ffce4379114da9c9756cb8c448b8910d6005fe6582e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FE 15048 bytes
font_02_sfnt_off0000ec99.bin
a6a4b88641f5de523831b56b6ed85a3e041eb59249c7ad66de4ef02a11f539f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 10504 bytes

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