Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cacd83107fdaee…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 14:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4bfe39de8fb2a71e3520d04f17fdb8cd SHA-1: 016a47b0bf89bf8709a9ce0c228dc69a3432c2f6 SHA-256: b7cacd83107fdaee819f53dfccdf602d446978e4b712901e9479a4014d695746
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=frozen+2+full+movie+download+torrent PDF link annotation
    • https://thietbigas.net/media/files/pavofizazezaxa.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/16573872541.pdfIn PDF document text
    • https://nada70.org/userfiles/file/66610497146.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/5970598890.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/joxagivofap.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/29550033926.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/90503458802.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/61321118440.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/91204049941.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/1959845510.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109042033141860.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/93532098810.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0aacabea---41297162068.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/nabebudimininiwavakejogu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/301581d833366a110640e4f018fad00f/49438403173.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/wezowunevasasasefo.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/xovobopunuwomagi.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/91560046620.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/85988075752.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/xinozapow.pdfIn PDF document text
    • http://insei.eu/userfiles/files/vafagirob.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/16743674072.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/netuxexukalujebetoxowe.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/98010449.pdfIn PDF document text
    • 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_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 18164 bytes
SHA-256: 9ab0e4cac7a09f73a0bfacd6f650cce1a3157de9095e799b21737a9a8499a9eb
font_01_sfnt_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 10756 bytes
SHA-256: a2604d593445791731c4b12734f57bb8702204fb54c6b46525108203b4608c5b
font_02_sfnt_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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