Malicious PDF — malware analysis report

Static analysis result for SHA-256 705d71c224856a13…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 13:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c79b1b2144bb9e2891037d07473c7073 SHA-1: b40787431607d9913387baa70594aa4f37b96b3c SHA-256: 705d71c224856a13bb60f8d5e9e48357c3880c26c91eb149124bdc7508004d48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are configured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users, likely for phishing or to serve further malicious content. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://crewmak.ru/uplcv?utm_term=itunes+vs+android PDF link annotation
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/movinaxaxozir.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/51447565756.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/44613249843.pdfIn PDF document text
    • https://terracell.pt/images/file/tuvinisawojusorezuteba.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zizosuf.pdfIn PDF document text
    • http://actinq.nl/upload/file/vogedanelifefovejed.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/sagojigajimogal.pdfIn PDF document text
    • http://christopherdallo.com/file/bokuretolejunopepuwepis.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/lazopaf.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/30520588603.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/mujezakupefifepanakana.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/39882387448.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/newelokasepex.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/19880178141.pdfIn PDF document text
    • http://onlinevay.com/upload/files/gemekuxokugevivax.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/bilad.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/werixofawusisalasosobojeb.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/82403891806.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/24764297679.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-13/20210913193148233808.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/323fb8ffbb2570d71548db5051b33637/22795024241.pdfIn PDF document text
    • http://scsytech.com/upload/files/85082008343.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/dowegugi.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/meh1ok9cbn9rafhcd9jn1f0jj1/51843855543.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/robazatunogozakorazepuriw.pdfIn PDF document text
    • 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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 17192 bytes
SHA-256: 6e0dae62785abf953b3373be0ad7e3be7622bad0d44e64df435f6e6ac873e2db
font_01_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCD 10312 bytes
SHA-256: dd4215e75d42c63a00d5126f8fc7c46fd59fb8999ec6d11223596709875964cb

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