Malicious PDF — malware analysis report

Static analysis result for SHA-256 359773011eca9174…

MALICIOUS

PDF

83.7 KB Created: 2021-09-23 19:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9a3ea231194a3449bbe4f03483857bb SHA-1: 1165d7a05b51af0961487376982d887f5576b9ba SHA-256: 359773011eca9174a0bfb36322758f63c2a4b2c387fb02347a4221416c29aedc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and delivering malicious content. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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=moviestarplanet+mod+apk PDF link annotation
    • https://leciv.fr/uploads/FCK_files/file/11044637731.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd4e005709---27913370126.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/76777461002.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/63071838232.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nejaxaji.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/kuzesujoxuwusub.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/13326065832.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/vasewezoxajirutegelevu.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/raxojolemenemukipekuj.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/16084331473.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/90742722860.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/vobisumafek.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/62947354964.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/pufagokekadiz.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/69900546728.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/92442234886.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb38c0d71---90593682246.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/fopokikuvagonurexab.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/95503391715.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/54303055097.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/99071795854.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/57154039671.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/fizonenizi.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/felubunin.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/76621332455.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/gimugimukewuzesavitijisev.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/fewafafigasilibewo.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_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 10704 bytes
SHA-256: e644c2fd0fcc47ebc1dc4f6054ae5d52d5de8c8c83c6afa86b058efd2b823a20
font_01_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 17936 bytes
SHA-256: 808ea5849dd84b13cb31231f79c1dfeed109e9ed7515c10c62f2d530ace29f8f
font_02_sfnt_off0001290f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1