Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62fa3c795fa693b…

MALICIOUS

PDF

78.2 KB Created: 2021-09-11 16:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78ea05610d22de8c94874ae015d93974 SHA-1: 1bec89ab0b9456e4bafea695d29f385a9720de61 SHA-256: f62fa3c795fa693b56bff01a0e941e65461353624a2ad88f6c0815cf2a6fae3d
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a tactic to obscure the true destination or distribute various malicious payloads.

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://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/emj2krt7up2aqq2l1eq7763t9e/volutefoge.pdf In PDF document text
    • http://lamexmarket.com/uploads/files/86701031977.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/megasam.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/59454118551.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/66616452032.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/juroxe.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/19109557575.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/86011474625.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/67886016454.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/xawivukisawigeziza.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/10720410387.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/56871399819.pdfIn PDF document text
    • https://tmtteks.com/files/kodegubezofivadefe.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/ruxetewalemanofoj.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/bevikotepis.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/46783700835.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/59827414210.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/niramevevexona.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/tavedeganiro.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/40817836610.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109040651461845.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378a74e642f---fijuzu.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/rofulepuzekoduz.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/35921003637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+studio+free+download+for+windows+7+32+bitPDF 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_off0000cd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD43 16712 bytes
SHA-256: ed57b2ddc6d74ccf2a25839915861f61bbaa14b7e9d51bfd8447e1d4a65a402f
font_01_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 10996 bytes
SHA-256: c3f31a49322bc5b519a7d78e53734e8d201790b594b48bfe3d3d393b89f780b1