Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cb6171f698b9e5…

MALICIOUS

PDF

85.5 KB Created: 2021-10-04 16:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 85a793428f5a69e0a1bbddf8cec3237a SHA-1: b4a0229c95f427a9c9c5eb30e1d993f44bb0fc47 SHA-256: 01cb6171f698b9e574e8d042067c017f35e2b547418e354828e59681e042c7cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to obscure malicious destinations or engage in SEO manipulation for phishing. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious intent, likely to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7f2f7ba02---33499728007.pdf In PDF document text
    • http://vibrobeton.by/pics/files/turareboxejuxofemikeket.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/zafijidato.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/feduloravimuwul.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/72531652772.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/58981494882.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/xunuguvakixofawod.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/kufimozogot.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/isd9vei9a7kbuit7irsfpu48m8/17059718333.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/44808531409.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/ruzufo.pdfIn PDF document text
    • http://airfa.it/userfiles/file/33812254578.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/95966188115.pdfIn PDF document text
    • http://didopack.com/files/tefolizomubewum.pdfIn PDF document text
    • http://orthodoxnews.us/file/bedepaduwone.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/xopemekupe.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/novuverubonifad.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-9-15/20210915231638905385.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/nabimujijasarepudadese.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/solag.pdfIn PDF document text
    • http://shopabrang.com/images/files/9069087526.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/81889899565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=radical+left+wingPDF 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_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 10396 bytes
SHA-256: 0198fbbb867812cf4649f9f80e300c5d36a0e26f9732e2acb289250027527fc2
font_01_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 19548 bytes
SHA-256: 8dcc87575c4c2bb229d8202f6a84ee4ed4fc71f5e6f5cf7d42cd92ae0b3a2f95

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