Malicious PDF — malware analysis report

Static analysis result for SHA-256 196a9b2cbd135b48…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 16:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 996823730aed23941d4a8261580fbb98 SHA-1: e6709f705863e0cd9851cb77d6c0f365e394b940 SHA-256: 196a9b2cbd135b48879fb5eb0692a7dee84487d5fdd445a518c029e28480e51a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://philabc.ru/uplcv?utm_term=billiard+ball+model+of+atom PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d195f3d5---rakifawiwefuzame.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/75356613164.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/2980046690.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/29980789871.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/40623902839.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/xotituxarudavidamen.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/19324785418.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/nodojadix.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/vevoxi.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/33449725837.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631811986_e1f1b62963.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/devumefuvamovodo.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/92578255901.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/12215557081.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631090707.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/kawefok.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/27403819516.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/laloji.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/jenilaxupi.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/91291894247.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/81652121451.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109090534225062.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/82215985532.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/20303667879.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/1705254363.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_off0000b2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A5 10436 bytes
SHA-256: 328301e9587bfa5453549e45af4a09623b8c7857c627524240f42be477e74465
font_01_sfnt_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 15952 bytes
SHA-256: 34bb0950f9ec5652184a48d8bce06d7abfa01c129ff153d14cb0c64473c054e6