Malicious PDF — malware analysis report

Static analysis result for SHA-256 51be3be6e9fee0b0…

MALICIOUS

PDF

77.0 KB Created: 2021-09-14 06:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 193730e2adb7066c5b8d9e19483d54a7 SHA-1: 62a34a4c8c1e2cc440a8fb1934c2161fbb8be2c1 SHA-256: 51be3be6e9fee0b0bb573eb55896881e0fd3d05cc861e385df616d63ee4268a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of many links, including one with a 'utm_term' parameter, points towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://philabc.ru/uplcv?utm_term=tom+and+jerry+full+episodes+online+free PDF link annotation
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fead1bd431---ragexas.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/zerenivakulejes.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/taraworikidewofen.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/bewofiriwaf.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/11726915957.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/32930051632.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/zaliwusizel.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/67805139120.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/51449456748.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/vedalo.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210904110235.pdfIn PDF document text
    • http://annabarons.lv/files/files/ruvavageloren.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/41166770221.pdfIn PDF document text
    • http://195exim.com/datas/files/32615168642.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/zedetufomipasoxib.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/75468617181.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/miwapasafubox.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/88280252.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/sivulaxo.pdfIn PDF document text
    • http://reichspfarrer.sk/file/joxejanugam.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/fovemokagedalip.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/vemiwikomef.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_off0000c4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C2 10868 bytes
SHA-256: 46406ef95e75ceee20c938723794248db390b0e15124332cc7f4e68679a31ce1
font_01_sfnt_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 19092 bytes
SHA-256: ba2a26ced78a4d83482edf568ebe64767ceb8715cc4ca98644a1ea98e9a56e8b
font_02_sfnt_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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