Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca712acde47f4be…

MALICIOUS

PDF

73.9 KB Created: 2021-09-09 02:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 7a0121e2048c308c4c5309df64cbdaf0 SHA-1: 0b37029c09c27cb8fffef50671b2cc44674c6276 SHA-256: 5ca712acde47f4bef12bd9bc24e9bfab5ce24aeae1d555730cf0cae2196fbdc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://clubesolbra.com/uploads/files/90614671665.pdf In PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/27541717045.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090907042040.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/kaliz.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/muwuvivi.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/wabenewusata.pdfIn PDF document text
    • http://samtle.net/ckupload/files/84152104586.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/jofasifogiwitagujovitupux.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210909054323_dehz8o.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/widobotuxukobexisemabiwo.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/32158333979.pdfIn PDF document text
    • https://razredna-nastava.net/files/43666981651.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/fovuma.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/60503200306.pdfIn PDF document text
    • https://hojoairport.com/images/file/36261897906.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/mokepevafalux.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/kezilosolerumovoze.pdfIn PDF document text
    • http://eternaseguros.net/files/files/40775357709.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/rolawolonowoj.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/wukapepopakawobemaju.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/kowikemelituguliraput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=igcse+year+9+maths+past+papersPDF 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_off0000bac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC8 17776 bytes
SHA-256: 937fbcc60492798a23d0bed85736f7864cec9a6f561641de4738f29f38fc4fb0
font_01_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 10692 bytes
SHA-256: 64827997246a27775ae83c6f2e1b3d5e8b30051e2e8333e7301845b1f16917dc
font_02_sfnt_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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