Malicious PDF — malware analysis report

Static analysis result for SHA-256 888013731e827fe2…

MALICIOUS

PDF

71.8 KB Created: 2021-09-11 10:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 66b2b3048f9129cfceadd85ad15f1c7a SHA-1: dadabf2247d3cb32cf83513cb14407c6a8d0ff08 SHA-256: 888013731e827fe2891ffdcfc9228fac1f8b54645be62cf61eef8ec12876be89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. The presence of multiple unknown URLs points to a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://redemaisfarma.com/userfiles/file/58495011804.pdf In PDF document text
    • http://dija.lv/public/userfiles/file/tasunerenepevanenajatejo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137653c5cfaa---pawofasopesema.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/gerugodiborawab.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/32498559280.pdfIn PDF document text
    • http://llux.vn/uploads/files/dedeku.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/rinerojizuwo.pdfIn PDF document text
    • http://webursitet.org/Files/file/xelafimusele.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/93601825325.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/54311320878.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631318444.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/15046106108.pdfIn PDF document text
    • http://0048.pl/48files/file/63339145389.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613895fe5f8d1---87575275227.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/sujuz.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/fegibujo.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/zavenivixurarunavolu.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109051644277769986hj3uu.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/96865568526.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/64563560587.pdfIn PDF document text
    • https://nomortiga.com/contents/files/18076110217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mantano+reader+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_off0000b545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB545 17784 bytes
SHA-256: 359e3bb870542f42b2d90c0104c65f63e89b0568c2faf41fe6538593a8677d39
font_01_sfnt_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 10164 bytes
SHA-256: 916c7c44c2e0b501c18797cb054acb57358358c3c4cb879ac6a54b916610e88f
font_02_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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