Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a5d50362fa106d…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 18:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f42be7cf7994f6187ae23bf89aa39895 SHA-1: 183610b4f8638b18d286be5264901bbecff1c65a SHA-256: 08a5d50362fa106d044a374e1151fe05efde43b6586686e66267ad26fa333f0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate an attempt to leverage web content for malicious purposes, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://agisinfo.ru/uploads/content/files/fobolewor.pdf In PDF document text
    • http://ristoranteyuri2.com/userfiles/file/92458890214.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/31118150795.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5e8f3645---22930747136.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/ludusetuwutagoxo.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/papuzotavu.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/6391483224.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/4439585718.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/kirova.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/3071340342.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/40402325432.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/59610131725.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/lozemadogofite.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/kuledik.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/voxikavad.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/vibigefisaboxosaf.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/18961287927.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/93900843053.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/vuxelenulafeniperi.pdfIn PDF document text
    • http://tcihk.com/userfiles/wirexip.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/ruvatov.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/24123833404.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109180438216154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=are+sandwiches+fatteningPDF 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_off0000b385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB385 10656 bytes
SHA-256: 948781f007eb5e1e7112bdc30e5ea63c3f34ee220a09e2740ea72924913acb1c
font_01_sfnt_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 16388 bytes
SHA-256: d88ce5f5eaedee597fc992925e1991d53f2ea1bf8bf665d88d68691f435296ef