Malicious PDF — malware analysis report

Static analysis result for SHA-256 620051573683d426…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 20:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8003285030f3eba4e28b81a4f05bd86a SHA-1: 48e6361b603adaa2405a45daa3756dadb8dba959 SHA-256: 620051573683d4260075558503ec263fc70da1b59e72f5ac00025e1f6c73f835
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure and embedded content are consistent with a malicious document designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://infrive.ru/uplcv?utm_term=best+online+mp4+to+mp3+converter PDF link annotation
    • http://colorfulmedia.de/fotki/fotki/file/91860310497.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/nomuduzorig.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/88928244300.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/woxog.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/40449529492.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/66045221426.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/pefoxapiduriwakizagus.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131caa4509ec---11138192342.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/miket.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/6612031077.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/6743282350.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/79c974d5331dabaf96da5540afb0cc35/gakuwegu.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/goxakutotujuzatinorori.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/77363564521.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/90211768731.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/koreroviketol.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/55374154821.pdfIn PDF document text
    • http://synergyproperty.com/images/files/87470064611.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/bukedodevizavuzodup.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109080701377102.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/vopedobekiname.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/87325531556.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/rosonudan.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/83863097837.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/55147432369.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/31102730230.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_off0000c8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C1 17172 bytes
SHA-256: 4b38c007da306d0cf1df6fb44d7b54cb1e1a2a4c621fbbde73243ca2670392ab
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 10740 bytes
SHA-256: 42909b7c9c883bee64f97c5d3f45816d900e192e0cb1818a13ddd3adfbe0cc4e