Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbf2113645fcccd…

MALICIOUS

PDF

87.7 KB Created: 2021-09-20 16:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dcbea7b2a5fa4565444204b614981a04 SHA-1: 9d42712877803a68f9bfee940e507ae456f6165a SHA-256: 4bbf2113645fcccd7ba66402ad642719cfd702bec0bb22ecbd861a916299612e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=top+strategy+games+for+android+free PDF link annotation
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/41dddbff94b41d536d9adc0b4ae2ecd2/12788447597.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/2559419186.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/jugigevu.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/86620728000.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/40844225295.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/sabirosugejurapiwomexij.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/fesemevovafopiwusas.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/sajopiwupubufujavox.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/gisofija.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/ziratawudov.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/31743245152.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/84522774460.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/leruwo.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/9972582241.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/suxabo.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/vigavoxotulajafemediluxa.pdfIn PDF document text
    • http://hbaoge.com/upload/files/kugovobameguzawidi.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614514fd1e7af---doxuzaxananuzanasan.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/15093478138.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/mofiperenov.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lufevowola.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/30955349063.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/56080920392.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_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 10872 bytes
SHA-256: 21918e2920928f2053a001997f110a2fc03cea3b7b7604b2d556e2a6537154c9
font_01_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A6 16908 bytes
SHA-256: bb21974a8a6b6920497ebb88f863b3fa2e3dfbb7244db19235e574f443c8ccf0

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