Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b18dec0e3d211c0…

MALICIOUS

PDF

91.3 KB Created: 2021-09-13 08:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e9248a626b12f6b525c22ead74822eb SHA-1: 9845edabec412ea56f2609c39e6ea8540ea38b2c SHA-256: 7b18dec0e3d211c0d9ab606696d9c236b11590315a7b41c85eb6541fa57ba5bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://surupaceanu.ro/ckfinder/userfiles/files/naraja.pdf In PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/bametuvixepitadotigunu.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/niduwatovilonik.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/liteved.pdfIn PDF document text
    • http://artediapharma.com/upload/files/kanusiditemosusitugidavog.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/kifakanunoletikaneb.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109091209039216.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/46765345282.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340ed35a277---97962762687.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/79959679615.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/61966015898.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/dupitovutu.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/wigikafinolagugetuxapex.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090618361933003.pdfIn PDF document text
    • https://777mto.info/contents/files/tetafefutaluropajiwagodu.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210912204437_svrpiw.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/telimerewarevol.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/jaximovibadobonedu.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/gugigo.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/pidazodukobumagux.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0cc7717b---vemuxokak.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/41119050803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=irumbu+thirai+full+moviePDF 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_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 17264 bytes
SHA-256: b5eaa726988ae4dc774094fb03c937e6a401a20b049ab865200e8228a9858455
font_01_sfnt_off00012fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDF 10464 bytes
SHA-256: bf6c27711bec7cdb326059e70194e805179b1a7ee4eb1743cc7c65dd4f565c9a
font_02_sfnt_off000147a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1