Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b387cdc0aa66be…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 20:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5d1c45652020cadf4f6b2be7d8d4ff2 SHA-1: ede826f3768c54d321350dbafca569c72099c111 SHA-256: 07b387cdc0aa66bef5e022ca3b1aa707a65075618c61ae5b0fe8f2d4c06566c9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF acts as a link farm and contains a callback phishing lure, suggesting it aims to trick users into calling a support number. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often leverage embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://phdpecs.hu/userfiles/files/91476534426.pdf In PDF document text
    • https://acerocorte.centralcms.cloud/galeria/files/12900517443.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/xenogadotidupamakew.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/bepexexanodidipatumebi.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/42089993034.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161446caee2c63---mimota.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/jadasavat.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/8103091273.pdfIn PDF document text
    • http://www.siposferenc.hu/html/sasugazovun.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/59616619013.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/dee1d8ca974c219bd9f4ca5f0ca7b84f/54916384932.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/sagiwowulobo.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/21222410275.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/87185527967.pdfIn PDF document text
    • https://btegypt.com/file/22101841799.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/92353590328.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/nupekirofepolinifom.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/56873272524.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/98181683560.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/wotejefalaxerugoneniso.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/20754474242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=croods+new+age+free+full+moviePDF 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_off0000ac34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC34 10884 bytes
SHA-256: 760ba87793e158c446294e267974d0fe5439e95bd082ca1e188ee6b812f5d537
font_01_sfnt_off0000c532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 15316 bytes
SHA-256: 83753c5ff2f208460eaa2924b46001730c6f033bda8802ead64b481942bb069e