Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf16c03927d0721…

MALICIOUS

PDF

84.6 KB Created: 2021-09-23 23:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1ffe40dd8fb7e6ddab9f17cd667fc70 SHA-1: b105db38983bd89678a22e3a48003d3db7725a42 SHA-256: faf16c03927d0721a479e2afc70aa0d1287b66aaeaa86d85fc91dc842ed99c46
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified numerous embedded URLs, with one heuristic specifically noting a 'link farm on disposable hosting', suggesting a phishing or malware distribution attempt. The document body was unreadable, but the presence of many external links points towards a social engineering tactic to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://mbeautyconcept.com/upload/content_images/file/mubesimavukozi.pdf In PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613760d3721d4---5384690497.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/diviramebajejena.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/sazawajutemam.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/66472226352.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/sikegolilimarukukoseg.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/pifanewifog.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/samakisogapixeva.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/37319894758.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/kutavi.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/32033705881.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/vuvekojuxires.pdfIn PDF document text
    • http://104408017.linker.tw/files/12206797995.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/94396707430.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/60783733864.pdfIn PDF document text
    • http://no1sushinroll.com/uploads/files/79116121072.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9674c530a---83098438429.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/gosabef.pdfIn PDF document text
    • http://usmleworkout.com/files/file/tosuxifolobeli.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/jiwudivupisonemowaduvusu.pdfIn PDF document text
    • https://kimansion.com/uploads/file/11681147298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=skype+android+download+chipPDF link annotation
    • 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_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 10712 bytes
SHA-256: 51721d40d41730bfd6f730c8962ac91c1133632c101fc436500bf53dc9d13ad5
font_02_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 19028 bytes
SHA-256: 291029ee1f7d6a25230bcc9fdf54bf42dcede42e92c0a6d72dec0f7088655281

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