Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f18c94eaecba7f5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 10:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc5ce024d70dfec8207585da19925247 SHA-1: 2583d8bf499cf9adc8fe356f0a1ba990f6c4f271 SHA-256: 7f18c94eaecba7f5ecab0d9b1497d93375481a376ab85564a0d893df53404dc0
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple external URIs were extracted, pointing to various PDF files hosted on potentially disposable domains. The presence of numerous links and the 'utm_term_redirector' flag suggest an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://woodlandhills.ilovepokebar.com/uploads/files/67047294820.pdf In PDF document text
    • https://rybczewice.pl/userfiles/file/loreramuzixituvazifojima.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/83384613052.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/96786337936.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f79da372b---nitoxipefanokolakinapipal.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/41997501646.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/lokowikike.pdfIn PDF document text
    • http://odumakus.com/uploads/files/ronetuda.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/makeka.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/sapavivutejojusodakiw.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/gaxarixopixaronut.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/99984242191.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/1630918476.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/tapabeko.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/70830175057.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/79503564732.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/13873026036.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/basajalipapunabevi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/retivenuvotaribodige.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/xobujowidofolol.pdfIn PDF document text
    • http://salwex.hu/file/bofuredukepogi.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/sarun.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/pexuxapon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pogo+apk+downloadPDF 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_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 10156 bytes
SHA-256: 41982f7f1a039c2adf96deeb70fdfeecb9977292b78d63e37c87f7942649d705
font_01_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 18036 bytes
SHA-256: 1cc53163de9995e5908dc6260c8bf40ef4c50b4cbceab1d773ac6f20656fdeda
font_02_sfnt_off000115de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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