Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b03036afacc7fa…

MALICIOUS

PDF

76.1 KB Created: 2021-09-16 11:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33c11fd434b23218130449e507b4eb2e SHA-1: 41746ef18ea72a2f3565e8a0fea634c2514b0fa7 SHA-256: e8b03036afacc7fa132b9c11b13971d88c6fd8f67f2e321b6dcdc10d02e0394e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm designed to deceive users into downloading further malicious content. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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 https://castilloexterior.es/ckfinder/userfiles/files/xoruvufenulex.pdf In PDF document text
    • http://sunmoon-glory.com/web/upload/files/taralewifa.pdfIn PDF document text
    • http://fitviewer.de/files/file/92512295089.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/wumoxurafefu.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/63971399017.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/17110456698.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/fivobinifuvikopipi.pdfIn PDF document text
    • http://packamate.com/userfiles/14429935946.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/xebafuba.pdfIn PDF document text
    • https://umutfm.com/resimler/files/wunezudirexigolivug.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/parusirexosinavomir.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/ledinexezerebu.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/woxisazukafabikakezenim.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/9942450323.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16305193386756.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///wutezeluwixemesasil.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/94789073980.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/tumafugejimikasebizirug.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6d4152389e25a3da5899d8dae7a6d89a/pasozopafusi.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/vedirufisekotamexa.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5d6666fac4c53303420add42cbdb484a/sowesupamavuxokotofogaj.pdfIn PDF document text
    • http://imbirimbir.ru/files/90552761270.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/xarifutibinuzej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sly+cooper+download+androidPDF 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_off0000c50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50A 10516 bytes
SHA-256: 08f0ea0cd3fe548f62006b913a15f96671917313bbea79945d98c4f1b106ba39
font_01_sfnt_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 17304 bytes
SHA-256: 9572b1eaf3ac978fb1b990a0307f3e22d5fa6f411fbb92bd79e573a5854d2da1
font_02_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1