Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d2c19745e26330…

MALICIOUS

PDF

72.8 KB Created: 2021-09-14 21:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f56c8157876f8d5d0b02c5474baeb45 SHA-1: fdb44d0f0990b0d2e402faba670b13481f21a817 SHA-256: a5d2c19745e26330207482a1c9f0738554172c5214b42073f04d85468fe9ccf3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crysiq.ru/uplcv?utm_term=ezrobux+promo+codes+2021 PDF link annotation
    • http://danieldesignpro.com/userfiles/korufiras.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/fufepu.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/85997263478.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210914144236.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/xiwakubejovofoda.pdfIn PDF document text
    • http://artio.pl/files/files/48399271225.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/suvuxog.pdfIn PDF document text
    • https://salonrewards.ca/images/file/boxabajufuxama.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907050350819074.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/powojawivulimulido.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/zoxumatawatebopabax.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/fulafo.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/zaniwolazonogekimuva.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/vofetisowo.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/romid.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/siwovezez.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/pifevibegi.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/ganuj.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/balag.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_off0000b9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E5 16472 bytes
SHA-256: 562b9e938e353991a6a5a5e88b3bd11ee67d38d31919a00c295fbabbf5d1ca02
font_02_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 10852 bytes
SHA-256: 7dbaf4eeda60b70e899069c85b4576adb9bf255aa2f6af87e7397d06540db7f9

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