Malicious PDF — malware analysis report

Static analysis result for SHA-256 3344fe1685815657…

MALICIOUS

PDF

72.9 KB Created: 2021-09-20 03:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83c76f330e6a1085c2f7aa3f70604937 SHA-1: 2f61e33fba8cafa5765bd09ea552d039310d2244 SHA-256: 3344fe1685815657d45005385174d5013b09701ca2a05677d3fb25a0003bead8
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 be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=solving+equations+with+algebraic+fractions+worksheet PDF link annotation
    • http://ainut.fi/userfiles/file/2717398275.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/pexapufafigurogafo.pdfIn PDF document text
    • http://nensi.si/upload/file/49964862490.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/kagijapereduraj.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/riwax.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/miniwatolomifazufuxobojog.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/tobof.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/77635822927.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/59313574963.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/vinujekenakapowo.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/divalemawaxopepafozuk.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/koxisomi.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/66573537629.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/kafewam.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/12bb0e186a7c7c915c264896b73375db/31737421936.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210909075432.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/46168736833.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/najipon.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/51291614062.pdfIn PDF document text
    • https://kawanmto.net/contents/files/34863617494.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccd1cc84c---xafijadawoparogefoxuv.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/siguziwajumanidewew.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_off0000b874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB874 16508 bytes
SHA-256: 096fc169ac16760032a85b0ab069b2fa816bfeb132c2a13e9fd82fe7998a811f
font_01_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 11320 bytes
SHA-256: 2c1e1131d13885cc56a9e7ca524872bc9b90ee78b937b9ba94802e9b8c405e16
font_02_sfnt_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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