Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c008a95aac3f62…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 02:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbe4e6bee9a8ee0fd7ebd3bdd14fb55a SHA-1: 254e6e5ac461b4fd8cc4a11534a8bf485dc3df5e SHA-256: c9c008a95aac3f62a99d6d655cbaa55280be75eeffc91803f174db1403ead244
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, possibly disguised as an application download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://doremimarlikinsaat.com/userfiles/file/nuvavigevemapageku.pdf In PDF document text
    • https://preciseenergygroup.com/media/80858327115.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/fanijakezewufavaxuwexarug.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137366add8c6---luzamikeboj.pdfIn PDF document text
    • http://parateam.cz/file/95980929817.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/19738696002.pdfIn PDF document text
    • http://kvrhousing.com/uploads/dadigebewoveboxalakefido.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/bakurodejivonakuwax.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/xilavuvawamugudoxatoso.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/86320860991.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/miwixifasis.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/98689612124.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/digotonekogekemebajujew.pdfIn PDF document text
    • http://uchid.com/uploads/file/99205670824.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/lopimasituvipomejonugip.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161359de772a4b---vuwemuw.pdfIn PDF document text
    • https://dm288.com/slicice/file/rolipesumal.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/golomikudijemob.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/8769917118.pdfIn PDF document text
    • https://theurbanthinktank.com/files/70987134169.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/45987659061.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/49302867837.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/poxeruwuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=omnitrix+app+downloadPDF link annotation
    • https://lapdonline.org/file/6206166221.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_off0000cebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBD 19772 bytes
SHA-256: 64b5291de30680db56e63be784d9adab99ffba24ad7fe5bff011d2edf83aa156
font_01_sfnt_off00010308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 10464 bytes
SHA-256: d51b1561386a842a59ae128feea4fb8951086def867e595751135ffb8b7cf77f

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