Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d039514ee541618…

MALICIOUS

PDF

71.1 KB Created: 2021-09-09 20:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 06c17b5f067c52393efeb535515634b1 SHA-1: 6be09d4ed75425fe528908894c300252839cebf0 SHA-256: 4d039514ee54161885d989b01e6cfe821795216ffe7f0ac8877930bda2f6a738
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to PDF files on disposable or unknown hosts, suggests a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nawooelcs.com/upload/userfiles/2021/09/files/210910011649.pdf In PDF document text
    • http://originalbau.hu/imagesfiles/20168214329.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/dades.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/lelutagefimodulefik.pdfIn PDF document text
    • http://signauction.net/userfiles/file/30359772574.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/wutajolinuwakijalumera.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a09e266710---84833808586.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/tukuripetanavuvake.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16136f50cb049b---nezudulekolimokasefa.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210903180346570197038.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xesafilufebesuxirenozi.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/69175311450.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/tinepumokajetonikeroxirep.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/jifebap.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210902084645_1281584502.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/41569157411.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/61710857887.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/47864194224.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/fipusesalapifudapotovi.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/84388211936.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/37936426679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=root+essential+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_off0000b0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F9 18636 bytes
SHA-256: b08a22892b9e9f4640b3eb0c7d311f6746302808f6cf755c6733ab438cdd583a
font_02_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 10280 bytes
SHA-256: b8be5f9f453bc626c4bb183d5d4907cbbafecfd891d98379454e68861652cb54

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