Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e21cefcd771848…

MALICIOUS

PDF

82.6 KB Created: 2021-10-09 16:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d3154c80f415d7347bf29d130efb01ae SHA-1: 4f5bc40736ee2f368befae8f288e6fac89ce646a SHA-256: 56e21cefcd771848ec121a8ba1509c2c8300c2124c633d95824b6cb9f90c3a3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=eye+twitching+anxiety PDF link annotation
    • http://gaytonfa.com/upload/files/fomowivov.pdfIn PDF document text
    • http://humanlitech.com/files/files/sapan.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/vazisofumixoxexemaxex.pdfIn PDF document text
    • http://pachinkoevent.com/sites/default/files/file/lepiwozagipitaworipib.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/20821549132.pdfIn PDF document text
    • http://archbot.pl/files/file/nefidek.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/27420118823.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/femezonoluwo.pdfIn PDF document text
    • http://onlinevay.com/upload/files/xusanavoxoki.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/melavovakeloduvax.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613739a093c2d---94864898307.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/68242620818.pdfIn PDF document text
    • http://progetec.org/userfiles/files/2195992168.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82540550908.pdfIn PDF document text
    • https://aayams.com/userfiles/file/72989009853.pdfIn PDF document text
    • http://safetruck.gr/images/file/20051103624.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/11504260457.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/69838017445.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/42692211108.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/9397422110.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/bosamoxajopoguka.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/kinamelakakoxo.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/6188580956.pdfIn PDF document text
    • https://33mobility.net/uploads/files/44497322189.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_off0000dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 19076 bytes
SHA-256: 78546aef1e695ec93eae06d18616069142ef071284c7fadcf62017f06a7493cf
font_01_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 10360 bytes
SHA-256: 9014fbab62c481c2fffeaf57a960684c120a5e1b848a7f1926fefa548b2553d4
font_02_sfnt_off000124f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1