Malicious PDF — malware analysis report

Static analysis result for SHA-256 737aeb277506dad1…

MALICIOUS

PDF

96.1 KB Created: 2021-09-08 19:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a44b7a19391a00b1305afa0f762fec8d SHA-1: 79a1fc1ca8c4aa0bfdc0cb1c775e36bd77f0c565 SHA-256: 737aeb277506dad1af28069a46e8b7191fdfd7aef859c5fce680752a11258297
134 Risk Score

Malware Insights

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

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 a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://oniceh.ru/uplcv?utm_term=early+modern+english+pdf PDF link annotation
    • http://fantalife.nl/userfiles/file/fumosapifegademunori.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/dujunixivokej.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/76447943842.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/65488075199.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/69581472255.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/vurowoxogujosovovepu.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/7081844311.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/24561821109.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/52772993596.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/14668534868.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/fuxez.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/jugasadawesevevikaxor.pdfIn PDF document text
    • http://seritour.com/rsm/files/nikejizarapejupiv.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/86953860418.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d3c676da---67828076989.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/kebizazexerasesi.pdfIn PDF document text
    • https://pecintajp.com/contents/files/wawilulis.pdfIn PDF document text
    • https://ferropula.hr/files/rebawefip.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161360d6553f50---vemategekizajuzosop.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/87052630964.pdfIn PDF document text
    • https://etimes.mn/uploads/files/53248435225.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/budelazexijajewogo.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/15815762583.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_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 21840 bytes
SHA-256: 88eb1ed332dccb34e2c345b599fee80078af0c13482887846730a227ad3b21b8
font_01_sfnt_off000141d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E8 10944 bytes
SHA-256: 288dcd3ddbbaaae37a9b93a75fe2d7c19f02c60ae69bac9f1f24abfed5dc57af

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