Malicious PDF — malware analysis report

Static analysis result for SHA-256 f800ec5b90431d6f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 02:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: caff4be15c48f61a38e88fb90d1d6a71 SHA-1: 9e63df1478908319dee28e7f29b699074a36a235 SHA-256: f800ec5b90431d6f9fc0e15f960409b1d5a2b38946443e9b258446f6acb97816
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the nature of the heuristics and the URL structure strongly indicate 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://ddtoyz.com/ckfinder/userfiles/files/26605126202.pdf
    • http://elementsgogreen.com/userfiles/file/suguzesijokuvax.pdf
    • http://venusland.vn/app/webroot/img/files/23680258871.pdf
    • http://studiodabo.eu/userfiles/files/zafufalosokuranenowowa.pdf
    • https://samirkumarpaul.com/ckfinder/userfiles/files/45035079580.pdf
    • http://1544-7419.net/upload/fckeditor/file/boratofew.pdf
    • https://nieruchomoscikomercyjne.co/files/file/13355965496.pdf
    • http://japhina.com/upload/file/jokobilamiwisidiwuzu.pdf
    • https://cyberbirddog.com/userfiles/files/63663292171.pdf
    • http://stoka-saarlouis.de/userfiles/file/bojujada.pdf
    • http://oumkua.com/userfiles/file/jekejosewiforuge.pdf
    • https://www.hippocratio.gr/ckfinder/userfiles/files/60865706862.pdf
    • http://kondicionery-pushkino.ru/upload_picture/file/97227199586.pdf
    • https://zerling.eu/nico/images/files/zejorasixowi.pdf
    • http://7seapharmtech.com/Uploadfiles/files/43811370096.pdf
    • http://barcabianca.eu/upload/file/boriporejigagujetozevimak.pdf
    • http://hadt.vn/upload/files/letikegibe.pdf
    • https://tmtteks.com/files/kadogitovofivonekudoso.pdf
    • http://architettosirocco.it/userfiles/files/xazevojajijukuxego.pdf
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/54328658270.pdf
    • https://dananeye.com/uploads/files/202109180256337402.pdf
    • http://tpfish.com.taipei/archive/upload/files/67638345478.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/22530179387.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=toca+lab+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c472.bin
19235cb884dce0377538b501c741507bf302306eae37f09ade41161b84b3a227		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC472 10300 bytes
font_01_sfnt_off0000dbd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 16792 bytes
font_02_sfnt_off0000f3e8.bin
c2cce52ef25cf7388a55bc2b8ebb5c73d780800de5def07baca017a3b0151d88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 16468 bytes

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