Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bf619caac5e9ef…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 10:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32bb0d42fdd7c39fcdcd8983a5f82855 SHA-1: 4c96606f61572aaeb5f6c1dc698ab322568d3d7f SHA-256: b4bf619caac5e9ef6dc02c132076c41890ecc838cc2f04c44727745308bad40a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'SE_CALLBACK_LURE' suggests a potential callback phishing or tech-support scam pretext, although the document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://jiehuist.com/userfiles/files/gokidukewoxetagaxejedul.pdf In PDF document text
    • http://dsagco.com/Upload/file/gejazemak.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/wonad.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/gaxuper.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/gedetupudigoz.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/89548113229.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/41556318060.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/sinudubozolojofutovazaj.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/figaravukona.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/dipakajur.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/jetukuxatid.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/kafepetixerawimuvulipotit.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c954259cf5f1bad3ccf5f255a97dbfe8/rimekaponorovimesewemasu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133412e609b5---papakedos.pdfIn PDF document text
    • http://ametansk.ru/uploads2/55096456918.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/rosukit.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/sapudixiwamodozeg.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/67195059579.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/19429506091.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/rejavefubanepuse.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/lapezimumovuvuferedisik.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/digasedutajilab.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/kizilutupokujosomikonen.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210901080133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=iphone+5c+32gb+price+in+bangladeshPDF link annotation
    • 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_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 18228 bytes
SHA-256: 148d326821d5617fa7ea13c7edcaa9ccecac1938406bc6c42751c952a11f730b
font_02_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 11212 bytes
SHA-256: 18ae1d6ccca6cad4004dcc42f02773392091fb1d0d633d46f2d00d9aa524e2cb

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