Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0f1672cf870ced…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 02:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eaabd4f69d8691155b14cf259a22963b SHA-1: 3bf8df3a5eba43159e9052413f00f55f20114b91 SHA-256: bc0f1672cf870ced683f3d65ceb495c6349ada74d771d0fa6f4567b53230ea72
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=obb+file+of+wcc2 PDF link annotation
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/vidugerenuxusapiz.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/22195759845.pdfIn PDF document text
    • http://cutskytools.com/d/files/xivovagukikunexu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b55023263---93320141067.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210906124940.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/linavijeraxobu.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/59962276345.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/70642554434.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/xukegolopobimunonilev.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/judofinalopuzozekidabipo.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/kuvaxinegexezo.pdfIn PDF document text
    • http://capri.lt/userfiles/files/ligejakovimirazasa.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/susudonogodanaloko.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/67821625890.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/38808442066.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/88038033115.pdfIn PDF document text
    • http://vejwun.cz/images/44396465931.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/91209145246.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145e5e210866---wafajufoma.pdfIn PDF document text
    • https://tuinvandecruys.be/file/mowexozujekogevep.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/vefibagat.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/7438073487.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/70120674818.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_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 18576 bytes
SHA-256: be2e1a5854ba3a79486589bd80b374b03e5be15cbeecdd9d8f5ce7500aa03754
font_01_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 10068 bytes
SHA-256: 07b73a4cf5c5616539972577016e2a84a986bacfe686ec2835dc2943a56d4cac

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