Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcddc8a18dcbab64…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 01:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41e0ad53a70007c5e026dd768404c02c SHA-1: 64c9bd3fdb0ca93d36cedb75d63eb345b95a0846 SHA-256: fcddc8a18dcbab649c460849e71068b915675328f87df67d2fc1f685831b6479
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URIs pointing to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links designed to mislead users. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an intent to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=processor+in+redmi+note+10+pro+max PDF link annotation
    • https://geneolock.com/ckfinder/userfiles/files/13280355317.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/fujipofiwolutu.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/kinage.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/zurufanubupi.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/3030010164.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/gadebivaxabuw.pdfIn PDF document text
    • http://varvshistoriska.com/file/37600376715.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/79948091755.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/mijamekepome.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/27765528379.pdfIn PDF document text
    • http://ridendo.cz/files/file/5270627489.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/30322859023.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/43779735906.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/87238520322.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/rumezoneferomaseb.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/91190959999.pdfIn PDF document text
    • http://www.og2c.com/images/file/26901529871.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/xerepapuxovapokuberibo.pdfIn PDF document text
    • https://bfull.ru/uploads/files/20326983548.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/38575447518.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/85743674650.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd8eea03af---50283844706.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_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 10908 bytes
SHA-256: 6c8e2faec2ceb9f2b5c2a0f76e2c6ace7f3eb964bad369e43d4ca4ce93710a6f
font_01_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 20000 bytes
SHA-256: 2ec1be6878d4faa7f64a2b841d087ca3b560b43fec0cb9d508fd2fb2b0c856f2
font_02_sfnt_off00012f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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