Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfc47cc30af97e5…

MALICIOUS

PDF

71.0 KB Created: 2021-09-14 09:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d0c094419808eb9f1673d028ca023fa SHA-1: 62e5b31112d5cd56ae0720a29934b4b308c6ec87 SHA-256: 7bfc47cc30af97e5ea4591de590d9c756152796f784f42a00f2c70c822180822
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially compromised websites and serve as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4abb9aeb---zalozekasatozitogibuke.pdf In PDF document text
    • https://anitt.in/ckfinder/userfiles/files/burinobiwexexukadewawut.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/jidazamobawo.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/33621353189.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/kugidig.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/31014149343.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/31010984695.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/bibiparijasebifizevigonam.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/25825174519.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/53229980600.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/53606100145.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0343a0f19a3d702f883e808fb80244a1/99817446349.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/fibudodagiz.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/xobojised.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/nasaxuxegoj.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/41944516888.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210913083601.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/rodejunifiludidu.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/72517637416.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210912072942.pdfIn PDF document text
    • http://safetruck.gr/images/file/31401203273.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/25406806861.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/45451567688.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/padagagorowiv.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/fedulex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=samsung+galaxy+s3+root+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_off0000b462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB462 15860 bytes
SHA-256: a1358a85a1789b479c36223f6717988126e07873ca05ffe076a8573c510acac3
font_01_sfnt_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 11028 bytes
SHA-256: 003d077fd5940893e0c2c2c5b50090d97ed3525c75c2533a7a8328a81de4a11c
font_02_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1