Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a5546e5eaef593…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 14:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ef2c287d79f8b436a78c309b0d985dc9 SHA-1: 06170bfabd5cf0034ccd140dcd0ec0065fa844ac SHA-256: 57a5546e5eaef5939c41384eae7dc3bd5c8beec55083cb459f4ce45be8469ee0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to obscure the true malicious destination through a large number of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://pixomot.ru/uplcv?utm_term=playing+farmville+2+on+android PDF link annotation
    • https://brawlcall.com/ckfinder/userfiles/files/venawosexumujotekirosikir.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/32709293546.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd86106b6---43409595738.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/80157500552.pdfIn PDF document text
    • http://torgoborud.org/images/file/47598342068.pdfIn PDF document text
    • https://geloracinta.com/contents/files/femoxas.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/26650791376.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/nedolabapebofewaxori.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/16683671263.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/89922222358.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/17303436249.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/kowitedeg.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/53479078771.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/25411123946.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/99724734e51f0f794418919bb0581e0a/ranesunilegapu.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/40398218653.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210911233128.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdeddcb993---nejunoxoxijeluronurudus.pdfIn PDF document text
    • http://ed-union05.ru/files/file/jadenisafugepo.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/moribavitemipuzexaposojuf.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/63993097769.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/saxiz.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/78626322194.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/8266320663.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/jarawetikepufowuziwif.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/580240417.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_off0000b3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CB 15204 bytes
SHA-256: 1a85b232077070f1035748695213d88b4cb86acdc03c904ec68a81d8f7dc3e7f
font_01_sfnt_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 10732 bytes
SHA-256: b1a8e6722f49a4f5f8b4df86a350be70cafa437d61587e8c80c44643a1276450