Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9da6acf8ebc54c…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 20:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3d4277e0d25b8d55159b21882e6cc44d SHA-1: 07ff294d6e2784f9e40d3e1da3534e7e9b31e6d0 SHA-256: 1b9da6acf8ebc54cf6f4c7738f0b50724bab23ed9671b8bb90af4cb07b3c67a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to disposable domains and are structured as link farms. This behavior, combined with ML and ClamAV detections, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=sex+and+blood PDF link annotation
    • http://hrdiborice.cz/erucom1/files/files/86064827089.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/72813294050.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf83260e3---favotiraxuvabiju.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/mogejubawositerorosowesep.pdfIn PDF document text
    • http://enewind.com/pliki/file/benexeremedurutolenaja.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/79043380628.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/zegunus.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/mizope.pdfIn PDF document text
    • http://glttek.com/userfiles/file/33022278227.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/wuliwelisugumozibiloxamu.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/15066515999.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210902_091518.pdfIn PDF document text
    • http://didopack.com/files/xasudofitovegagozon.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/dezudobudir.pdfIn PDF document text
    • http://zuche0551.com/upload/file/gagep.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/76919531600.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/49491119744.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/tapajare.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/mixosezewix.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/xiluwewukemoxal.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902215102257908.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/kevuxikisorizoten.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/vawigotumilakefi.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/nisajoma.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16157301e03d5d---86141983796.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_off0000b2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 10100 bytes
SHA-256: d3d958ecdfc0a0499c23fedff9675ea8fd86671f53444477e72107121e6faafd
font_01_sfnt_off0000c977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 17676 bytes
SHA-256: 4fe196d23e5414fac5ad9a1ef52fe97c31172b161ad7df7b279495d9354ee8ad

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