Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dafc108fdd257cf…

MALICIOUS

PDF

71.1 KB Created: 2021-09-14 13:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 003a7eba24d301596a7bb4f32412b0b2 SHA-1: 4cbcc69c4da923160f8b026a602f223905439527 SHA-256: 3dafc108fdd257cfbde9d200c3ab5d709591e5d59d0175740a3f791e078a83bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are used in a link farm configuration, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://catamma.ru/uplcv?utm_term=gangstar+rio+cracked+apk PDF link annotation
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/zuwiwiwixejapulawop.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/bimup.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duwerazetisodi.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-12/images/files/61638984790.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/86519574959.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/tabolijuguderusitogenu.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/titowopopuvujivika.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/11677846836.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/43120201046.pdfIn PDF document text
    • https://cecprint.com/images/file/mepewazisitizazakomosen.pdfIn PDF document text
    • https://yuktogel.com/contents/files/folemebinaxulewaturex.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbb9e3b20---pufozawovujikizolavureme.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/wukupurosatatapuxono.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/79811894902.pdfIn PDF document text
    • https://rotitelor.com/contents/files/birovejopefasopuvumofeb.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/27972921189.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/88160481678.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/7213448228.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/76454125368.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630523277.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/1102956428.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/85f2l6fuu6maq4ea20ve5l3iod/6270806102.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/xovowabegoxotonubep.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/23965321360.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/16010736495.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109052153298610.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_off0000b48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA3 10776 bytes
SHA-256: c3a96bb208b440448946eae93675bba7d9cd740102e1e8847288335428c944f2
font_02_sfnt_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 15904 bytes
SHA-256: c7d88d948f79806acd7a8027bca0d46ceaf2014d01e0fa83b78c5682c4508e62