Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa70c95d0160d68…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 16:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0821a8c1cde56e69ba86b108b636eadf SHA-1: e5b353ba0734856001a28992c04a83ee0d7f0ee9 SHA-256: 3aa70c95d0160d68ee787f42baee47b31293461d37791ed25548d09470583a2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest the document is part of a link farm designed to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the document's structure and URL patterns are indicative of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hotdeals24x7.com/ci/userfiles/files/83657295806.pdf In PDF document text
    • http://lamay.de/userfiles/file/jazevogimikonadidadabefak.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/biwopezoguxanuv.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/xulusogora.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/66225264400.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/mudarox.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/mijuginawijexozejo.pdfIn PDF document text
    • https://emenu.hu/editor_up/tobegevo.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/bubumadiritemilenezifas.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/95337719725.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16145d2ac678f9---58924077098.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/43806232529.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210918_174926.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/gobanonima.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/bujotubi.pdfIn PDF document text
    • http://zzquansu.cn/d/files/tezuvinaxinerupovuz.pdfIn PDF document text
    • http://stromzeleny.cz/file/dulotekuz.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/28555395933.pdfIn PDF document text
    • http://yoron.net/up/files/selajinarijem.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/53279292870.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/61078346534.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/xigaweberukuzesadogeki.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/63460274754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hack+en+clash+royalePDF 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_off0000b5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D3 10336 bytes
SHA-256: a089c2f0a4fe582e5b6107c1a498611eede825c1eca366c819f7faef5200dded
font_01_sfnt_off0000cd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD18 15096 bytes
SHA-256: 4879decaaacd04d9d1a86e3ade797a2dad0cc87546e0f7ed2215e164a09c742c
font_02_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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