Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a17b49f8c41179a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 14:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c0df9bf08bba8a40d894e6c706f9e5a SHA-1: 118eb1d08ad85b88a5e6cd764eec3a92592792bc SHA-256: 4a17b49f8c41179ac6609bf82d2bf1825d529677d27f3f997f5e949a9a9355bc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions. The presence of a 'download button' heuristic and numerous unknown URLs suggests a phishing or malware distribution scheme. ClamAV detection and ML classification strongly indicate malicious intent, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lexus-custom.com/js/upload/files/fozubuzifag.pdf In PDF document text
    • http://picassogift.com/Uploadfiles/files/zatewututelazivulo.pdfIn PDF document text
    • https://palet-school.com/files/files/dopanoladut.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/fiwokoluje.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/89296828950.pdfIn PDF document text
    • http://knipia.com/userfiles/file/21661835759.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/45555773183.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/timodipivasom.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/95361818408.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd373d3d89---56758419870.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/gavewalexutijaje.pdfIn PDF document text
    • http://trubaopt.ru/content/file/60689849131.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/redexiruloduxeg.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/petuxami.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/fupazafivenuvovok.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/9045315772.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xuzuvalabimunatefuvisudin.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210918071923.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/lovuvipesosamosuxizovet.pdfIn PDF document text
    • http://usagimatur.com/files/others/nesoduxupixozuxirutupenab.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091602323073499.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/68676467384.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/pajegifuverul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+adventure+time+ski+safariPDF 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_off0000c872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 18144 bytes
SHA-256: 4f449cf3f938cba6dc845b9e970da428dbba1c81b8bb78da7512648af59aad25
font_02_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 10860 bytes
SHA-256: 4ad9ecf7a9751f4897f22d25c2fe5e1e58588e6cce841a780fa0dcaded084138