Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17dff09e96bfbf7…

MALICIOUS

PDF

73.5 KB Created: 2021-09-18 17:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad836cc8f373893a3b2281ebe3ba1f64 SHA-1: d101083ee9188ec72efb0ba58f8008447e946cd2 SHA-256: d17dff09e96bfbf7e03fe202e6d7e97e6b3508d3b19925892bf0f686277a4bbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, many pointing to unknown domains, suggesting a link farm or redirection mechanism to host malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ltmetal.com/userfiles/files/famikotusiguwukapenifuvi.pdf In PDF document text
    • http://diennuocdanang.com/uploads/image/files/28448584130.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/gijafeja.pdfIn PDF document text
    • https://cncunse.com/d/files/befuwow.pdfIn PDF document text
    • http://vecsecity.info/editor_up/65301763118.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/wiginog.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/naxapezasovixutoroxo.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/55734484313.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/tipagusufisixozutolurami.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/rovotiboxedolamoruxo.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/rupekarurufowaxut.pdfIn PDF document text
    • http://congluc.com/upload/files/penile.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/86286310664.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021913_132341_827.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/kenakafunoxarajikipazi.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/tejov.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/wamekarejalu.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/23276275342.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/17058637451.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/lavuvikod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hip+hop+pads+apkPDF 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_off0000beb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB6 16660 bytes
SHA-256: dff42b3bb3c352cfe5dbed64667128d522d94d16408e1b0be71c739f15572396
font_01_sfnt_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 10092 bytes
SHA-256: e4f9e45bbe33d3b8155b76a916ef77ad4ef4ab4cc70ab4fd28c1cb282c860f46

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