Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cad41e77be752f…

MALICIOUS

PDF

98.0 KB Created: 2021-10-19 21:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4dae30f137868442b44cf2eb5166e9f0 SHA-1: ffb2fcb18539af9d223f165b885501cc74678ad9 SHA-256: 71cad41e77be752f57e6326e2c2f2af3ba099bb2913e0701a503c925597d3f1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://sirindhorn.net/upload/File/faxilawonejugagesamolar.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/88vis01b52s96d286pjr5kk11j/99766246380.pdfIn PDF document text
    • http://infunplastic.com/d/files/xajalatidowurededa.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/nasotipunezige.pdfIn PDF document text
    • https://agros.net/uploads/file/35881305989.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/46856321429.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sadaror.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/1774947034.pdfIn PDF document text
    • http://soc-in.com/data/media/files/86884089891.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/27890108138.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/32364039849.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/23962781676.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/31230803308.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/62286499858.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/zarazufur.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/pitivexewaf.pdfIn PDF document text
    • http://canadianrockies.info/files/file/lufizevuwezor.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=los+7+habitos+de+los+adolescentes+altamente+efectivos+sean+covey+resumenPDF 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_off0001152c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3E 19516 bytes
SHA-256: 5b37247286dadb206adb5e2cff4e97b657b79392e3f1a389b7ec7046763cb0a4
font_02_sfnt_off00015dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD8 11168 bytes
SHA-256: 129691cb4a41232068b160263633441569260416034ec522051134f1501c0c1f

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