Malicious PDF — malware analysis report

Static analysis result for SHA-256 53be02d170f7f45f…

MALICIOUS

PDF

91.4 KB Created: 2021-10-11 11:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eac13ea3bb1b9901988eb06ae4610ab0 SHA-1: e614c45188b1dd169d5af44d38d796647fafd65e SHA-256: 53be02d170f7f45f4180027c0586956fa783552acd820cc76478912c326aa3ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cesnek-vysocina.cz/UserFiles/File/61177863943.pdf In PDF document text
    • http://www.tobywells.org/media/fckdir/file/98019068038.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/mapomebufexojodor.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/jewetowegap.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/21204527787.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/jijumexagete.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/2158578427.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/18449933019.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/39358192106.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/49660082380.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/dumutononipizavujixe.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/51853629022.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615af90ce809b---11245800752.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/856481113615430e02183d.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/91716898704.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16163e6cd30e09---89951839977.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/poxare.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/48375441171.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/48095209427.pdfIn PDF document text
    • https://wiltech-hk.com/editor_upload/file/40803042657.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/16475144898.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/bomiwojeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=early+adulthood+stage+of+human+developmentPDF 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_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 18056 bytes
SHA-256: 3274b0b9aa6cb7e3f2ee10093161ba7b6edb23a288e1a486abdb071e9ebeb72a
font_01_sfnt_off00012df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14609 11116 bytes
SHA-256: f02d75ca4f178fbd8df1cb443c5929f29f8eab7825732d29be7c318ebe07eeb1