Malicious PDF — malware analysis report

Static analysis result for SHA-256 aceb8a8203b71c9f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 02:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 811dd38fd26fff4ddd1fd83b40c40032 SHA-1: 70be8bebbf3c302656e3e5f7be4465554aabedbc SHA-256: aceb8a8203b71c9fb50fbd68ed774450d57cd63b7f3f04dc87e2af45d3f717d7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs and a heuristic firing for a 'link farm' on disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of a 'download button' lure and a 'callback phishing' heuristic further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=my+movie+movie+maker+download+windows+7 PDF link annotation
    • http://word.mn/uploads/assets/rozoketonimuvu.pdfIn PDF document text
    • http://konberdbio.com/upload/files/68045664866.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/tusegizirutakofexar.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/88627344541.pdfIn PDF document text
    • https://digicpictures.com/downloads/8773523506.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/vubalerolafe.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/2444311514.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/16964342143.pdfIn PDF document text
    • http://uco-kampen.com/media/files/14656557825.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/loxofabewezobu.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/2994345373.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/kowijevilufigiti.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/19759231994.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/58712385474.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/57107429513.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/99663371985.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/64436036263.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/64313775729.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/34212833784.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/junekevexibogedik.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/zipabofekugaf.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/16e068265f718ba581652ddfd7afc188/ragiwasujukasira.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/3ccc5b0a80a2d9f1def7c837728c525f/wugonulo.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/43645167055.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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 21148 bytes
SHA-256: b4c25cbec7b4d942383cc21ad4eaed4f0bdc314b5c3cc05eb02252c8bb08bf91
font_01_sfnt_off000111e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A00 10712 bytes
SHA-256: 87666b7a6c30585c30ae37a63915eac743f547bd7b405ea877fe19f0c5ab575e