Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06ccac5f6a80c61…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 21:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d99f322acdf4608c812219496de96da SHA-1: ab10877b73e09d61fde19d3b1954badbce8c64a8 SHA-256: e06ccac5f6a80c61a72223161a1b8990d3ff0b77e59d8fc9f32c7f00f843ee87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous external URLs on disposable domains. The embedded URLs and the PDF's structure suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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=which+is+best+caller+id+app PDF link annotation
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/pukefafowumomokujejexi.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/79902116375.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/70464224434.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/xukutifadotafaxodudej.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e0ca4614---4484650516.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/xixibinonabigemesopu.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/43593826500.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/liwufavosixaxaf.pdfIn PDF document text
    • https://subarini.ro/mm/file/79461207548.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/58777273896.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/lenidaz.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/xiwodorerorobibitadu.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/mirejivufikemigaxujixag.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109120020242118.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/6757629256.pdfIn PDF document text
    • http://sieuthibds.net/images/files/resadutaguma.pdfIn PDF document text
    • http://candientushinko.com/images/file/digivumivosivamurivawex.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/16543430206.pdfIn PDF document text
    • http://www.puhito.hu/uploads/96577512303.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0afe197b---nazupolipufo.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/77548986914.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/31150433888.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210917142007.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/popadoporazikojumavapom.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_off0000c1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 17392 bytes
SHA-256: d046845568a11000ea1775b135b6c82eac265d9ca5449e977f2ac7b8d019f46c
font_02_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 10520 bytes
SHA-256: f63c9661b75a45a380e20e5cd4153610260f130c56f825f20390ea6387eb1822