Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67774176999763c…

MALICIOUS

PDF

87.0 KB Created: 2021-09-19 18:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64ee7a7f4d139f37b8247e4342337eb5 SHA-1: 1dd5299545d86bd9faa830a9e88ee1609ebb297a SHA-256: a67774176999763cd9575ab2e349568d48e20a95b7150384027e3a00d2120c11
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by multiple heuristics and an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, suggesting a phishing or spam campaign. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://kieryk.pl/img/userfiles/file/95182573787.pdf
    • https://kolkataangikar.org/ckfinder/userfiles/files/35170929314.pdf
    • http://asid.rw/userfiles/file/gepegisoti.pdf
    • http://pkpneu.cz/userfiles/file/89135033778.pdf
    • http://erh-hu.com/userfiles/file/16684815578.pdf
    • http://yuhao-tech.com/userfiles/file/gajubifawutobegowetu.pdf
    • https://academiapreprod.riportico.com/userfiles/files/21389716122.pdf
    • http://www.szphotar.com/admin/img/files/87969233112.pdf
    • https://silverbirdmarketing.com/pages/images/file/reserajiwukamagi.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/kerizuwejozozovoxigokad.pdf
    • http://rigdrilling.org/userfiles/file/40970588594.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/vozifegojopigololamox.pdf
    • https://institutdesante.org/userfiles/file/depujara.pdf
    • http://nuk-amro.de/userfiles/file/58836703237.pdf
    • http://christmaslandint.com/userfiles/pagokexetubiv.pdf
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/dijukirarexebixam.pdf
    • https://samsunyapi.com/userfiles/files/fidizeloxezuxubiwotu.pdf
    • http://apart1day.ru/file/21045892353.pdf
    • http://sameiroeventos.pt/ficheiros/pudapafokew.pdf
    • http://cuahuyhoang.com/media/ftp/file/69748569424.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4be4c65b---88740032984.pdf
    • http://yao-cheng.com/uploadfiles/20210901041337.pdf
    • http://lnv-cnc.gr/userfiles/file/jepodam.pdf
    • http://upoart.com/ckfinder/userfiles/files/75638169126.pdf
    • http://lapempi.nl/ckfinder/userfiles/files/87202356206.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400f2faf8d3---19784438596.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=unused+psn+codes+list
    • 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_off0000f11a.bin
e7edd150e160ad8841ede329a4c9eafb9242784d193fd71e47903d74d7e13694		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 17860 bytes
font_01_sfnt_off00011f46.bin
a3a05ce07839a5176681c2ca73ff3381e32ba03e104d6067992b338cc58a5cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 10352 bytes
font_02_sfnt_off000136b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136B8 16792 bytes

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