Malicious PDF — malware analysis report

Static analysis result for SHA-256 773596003e6e18dc…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 14:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1dc57c904ef88b469ee06b782e930b9b SHA-1: 3ecb2bd0ab380b616b27c544b876d36faee06ff5 SHA-256: 773596003e6e18dcdfbd4d810503508fbb60a69d605189118921c4023a260c9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=how+to+set+gif+as+wallpaper+iphone PDF link annotation
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16130f7042c15f---vazapuguxuri.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/6373978335.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/wenop.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/jivezalinovugikesojowava.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/90642edc005d47641e3ed88779b39bbb/jotonudozasizoladujafij.pdfIn PDF document text
    • https://reniuved.it/file/93291781270.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/87082037403.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/xeraforepimusaxuvef.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/16601062749.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/50517778717.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/febizilebaxebodox.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/19420822150.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/pepadefumovuworinegutenor.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///56517039705.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/19337135808.pdfIn PDF document text
    • http://ave-france.com/pics/files/dudifukivenelefozizozit.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/12576929842.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/sumozosor.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/82073655216.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/nakolekojidowusel.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/pomenosofaguwevewara.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/49914011567.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/vedekelog.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/40160561928.pdfIn PDF document text
    • 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_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 16852 bytes
SHA-256: 478969ab4718b62fe3fa40687ad33eac9c25863f32848fabcb64daa858cc1567
font_01_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 10712 bytes
SHA-256: c018ebf8ed23a41761ad06859884c44ef7b496bf61442e6f0283d1a60eefba3c
font_02_sfnt_off0001199e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1