Malicious PDF — malware analysis report

Static analysis result for SHA-256 8130204913b5329b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-11 21:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95c721fa071ffea18712cb0b1eb976e1 SHA-1: 69a54e3892cf3ed03a23571499b54ab26b7434c1 SHA-256: 8130204913b5329b00ff6f15eb72661131bf1f7264100c520983307335788fed
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of callback phishing or tech-support scams by prompting the user to call a phone number. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to lead users to malicious content or initiate fraudulent interactions. The presence of numerous links, many pointing to disposable domains, further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://butterfly-propertymanagement.com/userfiles/file/kekupovuganonezuvupi.pdf In PDF document text
    • http://glavis.biz/userfiles/file/1160707635.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/vagufoxinumi.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/20687366806.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/zuzof.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210903_20DF35660AE2E3EC.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/nikobubigezenabadiduj.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/soxafo.pdfIn PDF document text
    • http://bdsductri.com/upload/files/lujumalutopesokixa.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a14d1ee2d---93707397725.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/89789771090.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/bawesuwugapefakime.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/48363993987.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/vojatovoj.pdfIn PDF document text
    • http://ukrfirework.com/images/file/48203793056.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/pibelolabogatuxado.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/99720828659.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/89809573023.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/veteg.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/vavosazo.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/jolejedajesegemibosuje.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109041128548062.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/93310067966.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/25117260770.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210905_5E5FFF9805900505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=spyfone+mod+apkPDF 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_off0000b0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F0 15400 bytes
SHA-256: d0b1edab5080955c092277c307261479dfe4802c2d09e71c691fa8a87a912471
font_01_sfnt_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 10436 bytes
SHA-256: 9ff4f19cbc331568ece0a7f99107001a416c28cacb4c6d1f4dc4df6295b46c69
font_02_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1