Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53b580c17aa8397…

MALICIOUS

PDF

76.7 KB Created: 2021-09-30 15:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c68deeaf760181437cc55cc4719654e3 SHA-1: e35ab5fd47a152934e0ed5be53dc5d48e168f66c SHA-256: f53b580c17aa8397dbfb3ec34ab69992d0f05dc7bba44478f6afc27440b4216d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. While no executable scripts were directly extracted, the nature of the embedded URLs and the detection signatures suggest the PDF is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b11b5e5d8a---9792621751.pdf In PDF document text
    • http://vyveva.eu/UserFiles/File/nufunejezudixivupitoveva.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/lewukagemop.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/pubesom.pdfIn PDF document text
    • https://iwistw.com/upload/files/41903683090.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/rokosijelaxud.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/25260236445.pdfIn PDF document text
    • https://tigapilar.com/upload/files/24453359750.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/33207496577.pdfIn PDF document text
    • https://harom.ro/files/file/17730277040.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/23663904344.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/goletesijuvibokutobi.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/65432210731.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/67884698759.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/sajiduzid.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/92218781773.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/nelub.pdfIn PDF document text
    • https://maria-galland.ru/files/file/33379201660.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/94823701770.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/3035076949.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3a651dcf9---77486906618.pdfIn PDF document text
    • https://durimawar.com/contents/files/9037125713.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/wulopaxijulutu.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/xokotiwepipapurifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=serafin+antunez+claves+para+organizacion+centros+escolares+pdfPDF 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_off0000bd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD89 19988 bytes
SHA-256: 220e8f72fd983db1cfd2e28a9469bb29087374d08e41326a28e0071da3a8da3b
font_01_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 11096 bytes
SHA-256: ecdb84b1b1308997881d175cf873f78469d10fa6ebc49e374cfd2bc9c2846029