Malicious PDF — malware analysis report

Static analysis result for SHA-256 6731ab17b856b72f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 06:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 444ebc795642aafcafe5b075ab125fbd SHA-1: 38b79e6f924bf2a22486651d8dd19164ac7ad583 SHA-256: 6731ab17b856b72f15dce37829ac84bb762cc5f7d9f05b67b8ad045e7c851d4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the file acting as a link farm, with numerous distinct hosts and UTM parameters, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://zhhyhb.com/uploadfiles/files/35049069719.pdf In PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///wufuzemitonoluganepon.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///12025419443.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/21091015544204719852hig.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/pidofuvu.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/saxixilupilomigezulexerot.pdfIn PDF document text
    • http://safetruck.gr/images/file/rapubaluzinigevulipejiba.pdfIn PDF document text
    • https://funke.be/data/file/39105373048.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/69612957281.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/lipurerob.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/bamozidox.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/vazagojef.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/lujopuk.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/risudavapeseripis.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135974cc0564---laxedimik.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/diwegotolux.pdfIn PDF document text
    • https://irrisyst.eu/files/file/92136939953.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff6c8c6f73---85752395008.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/18117925020.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/31445209703.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/wugajab.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/12689178036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=perfect+viewer+androidPDF 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_off0000e1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 10408 bytes
SHA-256: 35d0b4c2b54ff8498ec64b7cb1605585aa73d7e9274227e15cb4f303f80cfebd
font_01_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 16956 bytes
SHA-256: 3ac8bcfafaeb400c2bbac478e03a1031d40ca714f5872b248bf5338a0265bbbb

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