Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b16a9d5e23f1f48…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 05:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ac129170c0d968f5857c0d42c6baa38 SHA-1: f3ce9be1f76d97f781fb798144122d741e036b10 SHA-256: 1b16a9d5e23f1f48d64efe7c63f579e714da6bb6aabf4fa7dc02bae421a09282
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=samsung+galaxy+j7+prime+firmware PDF link annotation
    • https://sitpchemcieszyn.pl/_sitpchem/file/56031588070.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/5006221256.pdfIn PDF document text
    • http://lg-palette.com/upload/files/97271754685.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/67141601996.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/nizowuwediguxekesa.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109011534406553.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/tobobajegedo.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/5270979546.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/58176682678.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/povipifutudimenanowatugo.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416f72eab79---jewivipogeroris.pdfIn PDF document text
    • http://dytac.hk/userfiles/72459086091.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/7930916569.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/8554207036.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/zujakefunakizu.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/rukavofu.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/84001688335.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/vexetejabawujove.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/fetudibigepinanu.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///xoneradejenu.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/97614626239.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/ropifajoboxeniwemo.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_off0000d55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 18728 bytes
SHA-256: 3e7919f079d41be0be09c9c586465ea984ee8ed76bf882941d94e6c04c53e425
font_01_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 11140 bytes
SHA-256: db6ace21fdee35d020fabf1bc52aa16d6bcc94df23fd202d8dc4d6139a6205da
font_02_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1