Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19a3ab7e94a756a…

MALICIOUS

PDF

87.1 KB Created: 2021-09-21 00:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e554243711a07471349a14e2b74e4e01 SHA-1: a30a59a006c5848434e739563fd0021bfd03d43c SHA-256: b19a3ab7e94a756aeb93d6e62c01d308695f5989214f8e25b7825f9315cd639a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://philabc.ru/uplcv?utm_term=is+spinach+considered+a+cruciferous+vegetable PDF link annotation
    • http://w3-japan.com/js/upload/files/44712090841.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/regidofofasunusizuzokoxi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/29193398553.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/71411189939.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/kinujagutigekuxekobubulev.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/fuxaros.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/duwawebuxefawipelefomo.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/tuvepotebukajonabiwazavo.pdfIn PDF document text
    • http://farmina.ru/uploads/files/88825867285.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/88679131586.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/32040020024.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/51334266433.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/42645606939.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/52950666676.pdfIn PDF document text
    • http://mqskin.com/luutru/files/69525846216.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021091313585773499.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/towuduri.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/90541327364.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/fikowipegodomexudu.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/xovaza.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/vumovulilujakef.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_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 17652 bytes
SHA-256: 165b4305d097e78a91f5caba534b408c1bda6bc52fdd684a2fb560837634853e
font_01_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13588 11156 bytes
SHA-256: ac94f736d76ce2259ecacc10a68dde28f34e188af3ddad3c7b72c19fdf3702df

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