Malicious PDF — malware analysis report

Static analysis result for SHA-256 46588dfb005444c6…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 11:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee0809a9b396b87fdc240f4b3404947f SHA-1: 787ba4c9ef6beaf3571bfd82ade3ac2edded9c0d SHA-256: 46588dfb005444c6b291074c10af1150d441a143cb067ff9bade4445d5853ab6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=how+to+transfer+from+android+to+iphone+after+setup
    • https://www.casestilistas.es/ckfinder/userfiles/files/62947437693.pdf
    • https://szabobuszberles.hu/files/files/wafir.pdf
    • http://ipceurope.eu/assets/file/37639820617.pdf
    • https://hiroyoung.com/data/files/jopebagesivebufif.pdf
    • http://wagnerpc.com/userfiles/files/37303743542.pdf
    • https://hse.tw/upload/file/sogilaxoxojifejuvoxurores.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161342dba119e8---mimiz.pdf
    • http://31kouqiang.com/userfiles/file/1631852922.pdf
    • http://exteractif.fr/pictures/2/83245131773.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/worosukogamezudupi.pdf
    • https://legouic-peinture.fr/userfiles/file/46622499871.pdf
    • https://adproissy.emailingmanager.com/uploads/editor/file/rupowebanowewuzuji.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/jupajaxulutivabotexano.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/torovonawirakur.pdf
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96228218515.pdf
    • http://lulanjina.net/upload/files/zejuzadas.pdf
    • http://aktien-analyse.de/images/File/3967679333.pdf
    • https://sanmuabancongty.vn/images/content/files/xanurufu.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614400f30282a---zudakaleluvizurasemupad.pdf
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/sonomevonujuz.pdf
    • http://www.psyforyou.nl/upload/fckeditor/file/jibimabijepusavepodawo.pdf
    • https://itscebu.com/upload/file/20210909105841.pdf
    • http://carywinslowlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tufujigavikibupinuxe.pdf
    • http://soupworld.de/upload/file/6478638692.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b472.bin
8b4fc5f0a25a1c1104dac39af400ae298e56ce3b3c97108e24861fb8c55f1502		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB472 14772 bytes
font_01_sfnt_off0000d96a.bin
dd4ddcec772eff7e624c862246f4d5f77387a66110399fa0835cee58813241e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 10896 bytes
font_02_sfnt_off0000f274.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 16792 bytes

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