Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b994c2b1b048ca9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 02:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ba32ac66bc89ba8559f477d3e1fc4f5 SHA-1: f748d527759509ed3594d8c85bfa8bc092169754 SHA-256: 7b994c2b1b048ca9d0e74cbe98d00279c7c22d9ba98843d447469f6107871709
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code upon opening. It also features a high number of external URIs pointing to a link farm, suggesting a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload via the embedded script and linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132f19668098---jiloluzesozotiperakapigif.pdf In PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/7988479814.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/ponedovukibane.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/xumekumudosamipadalexopa.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/fecd1d000e25b83e9a01ad0149ab6b5f.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/37387732122.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/fofedejapetotetusaji.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/rokomugigerivubolokaf.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/vapimufidewusiwujururu.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wubesesora.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/wutetegudipemexize.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/69289483661.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/vadebotunesajudinovojawi.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/nuwakeb.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/03/83047554313.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/xuzerijivomij.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/bokovamovox.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/golowotesuvutadizur.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/jazixabepezofeso.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/885e051a38d0b32f67d881ee2cb6a80a/20642152363.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/mazexezetifixopako.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/sumumamape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+is+android+folder+in+internal+storagePDF link annotation
    • 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_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 10628 bytes
SHA-256: 7cc95a880505f2892ce02640cfeb2ba81178a448ee1dd82b0dccb4ef3f6b7ec3
font_02_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 19068 bytes
SHA-256: c955af05414ec9e1c620f0c932843d147894239cd0ad87a9e698d2d2884f4524