Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3d486f840f45e3…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 19:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bf613766533d3fb676db6b80d032fe96 SHA-1: 2c6892ff0f3f6e3c5da4d87dc322ebd0d1a2d36e SHA-256: 1d3d486f840f45e32ec2b055e06c41f5ce93388991e42b6162b1c5060642d351
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no explicit scripts were found, the nature of the PDF and its embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://karjerastests.bankai.lv/ckfinder/userfiles/files/50353925298.pdf In PDF document text
    • http://abwrva.com/uploads/files/75829410364.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/77328708873.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/temedikujogomuguninutuwoj.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/36154077277.pdfIn PDF document text
    • http://supportsite.myersi.com/images/e/file/38603415971.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/nedol.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/88840498771.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/xuguxozutu.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/katevepafiwokizimarusa.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/navutakulifutorokufa.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/36023797738.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/37588223448.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5q0ifjr3apidm0orbb6ul4ae7k/wibuvezaru.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210917185453.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/janekonisonetipibojubu.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/fekuniwol.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/2029665573.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/woketipax.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/wupitorifepi.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/81169517383.pdfIn PDF document text
    • http://secretinvitation.net/images/files/35641688081.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/movajatinixupur.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/57553359475.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/40425761413.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/13280665267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=grey+water+in+rvPDF 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_off0000b05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 15352 bytes
SHA-256: b133c76b5a7121e8ced7d4b4b63724c79a279892a17ac27de1e3703f1a0c877e
font_02_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 10072 bytes
SHA-256: 9ca941392c4da9067a64780a26115653a8e8a5b107fbdf653cb1d51564a1f788