Malicious PDF — malware analysis report

Static analysis result for SHA-256 79410057b2aa9c7b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 22:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f802c6eb8a04f0064bbd7135a982a7e1 SHA-1: 11ab76fbf1103fd777bfc39415a040eaca85b9ea SHA-256: 79410057b2aa9c7b4ecb7514e7a0b23b9c5f72b9a902b2a9f5ec8b722eec127c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to disposable domains, with one prominent URL being 'https://drafthe.ru/uplcv?utm_term=video+call+to+mobile+from+pc'. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=video+call+to+mobile+from+pc PDF link annotation
    • http://mulroyenvironmental.ie/userfiles/file/falamomuse.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/mibusel.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/xupasodakesubazepagopi.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/48125563240.pdfIn PDF document text
    • https://senegal4d.com/contents/files/52509547211.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/91760068535.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef44002c8f---26386110930.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/rakawaleb.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/88931575917.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/31788682844.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/71266272321.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/97103594066.pdfIn PDF document text
    • https://mcsfood.com/images/file/54390958698.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/tolupinexemipovolu.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/92769987853.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/56256147095.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/98417057000.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/begalabopasosebidu.pdfIn PDF document text
    • http://elma1.ru/!upload/files/33057354183.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/8170179682.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/90342388042.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/97575015600.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373f2eb31e8---88840023596.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/92011397827.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_off0000cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 10620 bytes
SHA-256: 55dbb8268280ed2282a79a1d4fd1faa10839266948af04fea1b4991b28672722
font_01_sfnt_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 17812 bytes
SHA-256: 16a7d2e94d9cab9017ab54671c03fe2789c084fc92afe9da807a6acafd3528a9

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