Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa127612b769793…

MALICIOUS

PDF

88.2 KB Created: 2021-09-21 06:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de65ee4689406e6194b9d372f1c27e78 SHA-1: e4b96a44e7b0d5b0e753858f01d384a45b9cd4d0 SHA-256: 7aa127612b76979340b2d043027488168e2af992e2c3fe6b0ef2d1c2589a4b6f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URIs, including one that directly points to an IP address, suggesting an attempt to download further payloads or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=whiteboard+animation+android PDF link annotation
    • http://dragonspond.com/uploads/files/32796254505.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/47842122813.pdfIn PDF document text
    • https://ms01bet.net/contents/files/wekol.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/lutifapodomesalodakevere.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/karipaxijekoxaji.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/sirupufupofezulexo.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/sonoze.pdfIn PDF document text
    • https://parkettworld.com/upload/files/53340563749.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/27029743045.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/revakigotirideledu.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/34975482123.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/fe9hb7875evnaiqd1u8gol9pq0/55338717525.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/20211938459.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/zorirodezovup.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/39908476596.pdfPDF link annotation
    • https://harrisitalia.it/uploads/file/sodusaji.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/83974396990.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092106130127.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/xevarokapu.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/88166910251.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/pusizexa.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/73455720532.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8ac1e73f3---natok.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/xajigujexulafabuz.pdfIn PDF document text
    • http://c-amc.com/upload/files/16639384126.pdfIn PDF document text
    • https://slide-bearing.com/d/files/71570761162.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_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 18224 bytes
SHA-256: 9e99c45cf691161dd55ee8b115942ebff2b2cbde2eda629625c7bb38cd03ba10
font_01_sfnt_off000123e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 10432 bytes
SHA-256: 298de22879c69f01e2e3403cfd94319b9f0ac8e04ef7778aa87747ad382601ed
font_02_sfnt_off00013b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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