Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1a711cdd520d15…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 21:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9d593c6d5b3f37735f26d65cf41e472 SHA-1: e6cf8cc3f53d9d0da0d54e7abae2403c34c683e4 SHA-256: ea1a711cdd520d1528136dea7f1d66cf923396e7008e6a9e073f452d3f48b927
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded URLs suggests the PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://coretry.ru/uplcv?utm_term=videon+pakkaus+android PDF link annotation
    • http://avon-bratislava.com/files/files/11981310039.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/29919974560.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/79302533069.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/27082453401.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/68640141400.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/zujonafegevusenadapife.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/zuxezavetokefe.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/viziwigesotozagulasezadi.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/ruxadez.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/6207051430.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/dezematag.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/99750113513.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/jikuliv.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/91420846679.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/bizigubuk.pdfIn PDF document text
    • https://manenshop.com/upload/files/nujolododuwepu.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/godite.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/xajobabep.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_off0000d050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 16792 bytes
SHA-256: 6f9ea6318cebea850446bd34124e767996366bb1ed3fe7578f99ab2053e217c5
font_02_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 10404 bytes
SHA-256: 76110499e4917de362ed153640cfb892d5fe0a717059e4647ea8e5c04cef32d7

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