Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca5274fa2fa2046…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 20:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fcbd22daab37e7230b51398af70cd2a0 SHA-1: 35c0580c11b026882b26bb07e8b5c9c467ed7bde SHA-256: dca5274fa2fa204685d03a5e5143d9958ea9b172a672eb6e607db42383addf7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=rate+of+change+calculator+table PDF link annotation
    • http://idcla.net/upload/files/vobuvomekozutafezote.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/2481016690.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/50469035365.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/42197476877.pdfIn PDF document text
    • https://fultoys.com/userfiles/buwiferevunex.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/9860771412.pdfIn PDF document text
    • http://signauction.net/userfiles/file/gizosubojujemado.pdfIn PDF document text
    • http://kvrhousing.com/uploads/20543729437.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/zupegodi.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/94366251127.pdfIn PDF document text
    • http://lj-group.cn/upload/files/61921717557.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109171035593569.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/78832862239.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/72305097769.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/nokumurimoxon.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/divibage.pdfIn PDF document text
    • https://salwangurugram.com/files/35579266072.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a916e35a---lulewuluz.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/kasapi.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/51629888652.pdfIn PDF document text
    • https://kildevangen.dk/files/suvamowutamafitazobu.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64971354745.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/dazufuniwebenufumitipumus.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/1954784501.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_off0000b4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A6 10640 bytes
SHA-256: f22b5a785a4cf909ac9042f5df45b6afda852e315e7294582a79f117d8917570
font_01_sfnt_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 15048 bytes
SHA-256: 8e401168f943b7634ff62f9f2eb136decf298cad4d97935a2bab3b0ba01aee50