Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad09ff280cb1bdf7…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 00:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a6f49758c23f65b1ed7c5290ade1b605 SHA-1: 484ac43593404dba7966cc53713d7d81303844a9 SHA-256: ad09ff280cb1bdf7c8141a73e12daf8145242223db0e41529136799f6ebd234b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://studioscoponi.eu/userfiles/files/wufupekutatosemamojoxuka.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba51e4d60e---60491909112.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/natanewiruluwatopu.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/40092287494.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/terejozapopomotuzen.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145332c98cc3---97698408238.pdfIn PDF document text
    • http://jonme.net/ckupload/files/mamukoxe.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/wifazoga.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/90441887083.pdfIn PDF document text
    • http://school15-tyumen.ru/f/rirujatepagenoxefan.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/87205308161.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/36551879335.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/71013695770.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/nonusawenawibitezoved.pdfIn PDF document text
    • http://seamacros.com/upload/file/rixobasugagusikazuzij.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/35516674638.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/28270314643.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/91626449929.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/judabaladoxewitisu.pdfIn PDF document text
    • http://info56.ru/userfiles/file/sabug.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/42376608487.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/migakebiga.pdfIn PDF document text
    • http://safetruck.gr/images/file/xagugurorifanusemafarad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hair+challenge+game+free+playPDF 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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 18856 bytes
SHA-256: 61303ebae23f5e911eb17ddfa0f9441ab650be7fb5a95b48a97642cda572dedd
font_01_sfnt_off0001130b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130B 10648 bytes
SHA-256: 006536332c3bca2b53c34e08ac6a9718abea3e12b9915aa2c04f50dc0e740716
font_02_sfnt_off00012b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1