Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eb82876ef29f16…

MALICIOUS

PDF

74.5 KB Created: 2021-10-02 16:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dc0a565a3dc0689fa0b0a6562b3bf9fc SHA-1: a5fa454dacd401f9cef6cb5cc7b34b14537d5a7e SHA-256: 88eb82876ef29f169143070a25cbd5c5bd58c999ca2f4327eb93a132ff31d858
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, where the user is prompted to call a number. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious intent, likely to redirect users to phishing sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=antipolo+city+government PDF link annotation
    • http://vnndt.com/Images_upload/files/93658207458.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/90338338150.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/72726102436.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/gajilezusokifariwe.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/17915121296.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/22271986495.pdfIn PDF document text
    • http://balone.net/_upload/file///42280441425.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348b12f1ae0---xuweterigatefasofikadebo.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/54152062773.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/87657683165.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/bixuzaf.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/66169241831.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/ralamulemasej.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/lilesunoni.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/penapeluzene.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/5119800342.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/782466534.pdfIn PDF document text
    • http://djapm.com/userfiles/file/3002479571.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/lolepo.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/limojozulisizakorode.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/36586143311.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/ruxemevujipuli.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/69051242381.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/ritepomeferugiguvew.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/64138294991.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_off0000bafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30D 18856 bytes
SHA-256: 8763c5acac62c91dd248ce4198d9c7fe398f973c9e221b0b47a0833575713072
font_02_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 10548 bytes
SHA-256: a3eff9f8b67375e2f136c51f030033068c30daa332e0c644190f40edebac9f16