Malicious PDF — malware analysis report

Static analysis result for SHA-256 010bcb2499aa2a22…

MALICIOUS

PDF

95.5 KB Created: 2021-09-23 18:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14a7ff0ff19acf9d99fefc72aaab593a SHA-1: 1c99e9423fbfc1d18ea6b8ce5a22e5f75d652984 SHA-256: 010bcb2499aa2a22a4f2cde3582b15676f0448bc8db9a0b81a63338427535e18
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs pointing to various domains, suggesting an attempt to redirect the user to malicious websites for phishing or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=como+bajar+musica+gratis+a+mi+android PDF link annotation
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/jirafafazirokejuvotugifen.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/kelonadolopekirazokezi.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/bafavututamuzatexokej.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/83307770157.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/gekifokevaxeretawigulid.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/vepajiju.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/vebikaketufare.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/77223278494.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/lubugoratenetujivunik.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/54522534113.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/feluxowowojumuf.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/56738455477.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/81348740758.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/domanukewuwezaxog.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/gafal.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/vejirasaburepaxugo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8f7bb5d42---fenigug.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/605077241614727c326f48.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/35094088039.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59520c95f---67493188599.pdfIn PDF document text
    • http://senkyu.jp/webroot/img/files/barokoximol.pdfIn PDF document text
    • http://workontext.ru/media/file/xaladimanediv.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/talokesevinumagexer.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/gutixojotusefufedavoxig.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/dipuganuvozominofoxo.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_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 10936 bytes
SHA-256: 5a9ac94da58b81aaf9fd9ad9b5fd02da15c1a2b374c9b7a68f9cceacf7ff85c3
font_02_sfnt_off00013c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1F 20256 bytes
SHA-256: 6473c1adc03bfea3014576ccab8ee1bd57a7889d28a7fcc13ddfba98945125a9