Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d722273d2cf5540…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 22:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a19c2f7a2498ccf6797ba35855051bf SHA-1: bb4a0a5a815fdb82cdd88a2ec61746d929df054d SHA-256: 9d722273d2cf55400ed91846d196a900552f34906499a14d6b11e6a972c215e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous external PDF files hosted on potentially disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://elskenecologie.nl/files/55186433088.pdf In PDF document text
    • http://fatamorgana.fr/uploads/assets/file/porekorekiduxip.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/44163952219.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/27251416179.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/45555523855.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/famoburig.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/35851988377.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/rusodajuziratumupaxafur.pdfIn PDF document text
    • http://llux.vn/uploads/files/maborizixonulis.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/rejirotimozodipu.pdfIn PDF document text
    • http://rentaruedas.com/files/others/79651816648.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/velimoserobazeroga.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/birijijekobi.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/71396562581.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/junibug.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/76523119351.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/30402408657.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/guvifilurimadovexek.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/buriwiwijagibixogi.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/lazitodinosegas.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/gakujupowitine.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/91956050915.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/n1h467cfhf7cn0l8cg9pscbl6s/zobapebowonutovoxitotajig.pdfIn PDF document text
    • https://uangraja.com/contents/files/sepusatifet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+wallpaper+greenPDF 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_off0000b02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02C 15504 bytes
SHA-256: cb2dfb1c72fa85c9492e9df083c73bd20d7f243d8ba0de4e50c32f57fc718b53
font_01_sfnt_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 10368 bytes
SHA-256: 360876c06e8cc7ebf2702900a331965e866965358a9f9c6d6ea070991976b066