Malicious PDF — malware analysis report

Static analysis result for SHA-256 995e78156e9dd1f3…

MALICIOUS

PDF

71.5 KB Created: 2021-09-21 04:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 797d12f3fdfb458cf5464a93a53f42e8 SHA-1: 189ce82957446a2a22076a80aa6044f504772634 SHA-256: 995e78156e9dd1f322caa06af7ffa7c99377536c19a3b706228ccc65cee64072
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. It contains numerous embedded URLs pointing to external PDF files, indicating a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a malicious intent to obscure the true destination of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://adeptos.clevercloud.pt/images/items/files/rusigugurodovaza.pdf In PDF document text
    • http://precisao.org/files/files/virujuvaliro.pdfIn PDF document text
    • http://ipceurope.be/assets/file/49681117097.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/6747817075.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/wesogepulerojugu.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109151947386114.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/43270110663.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/79677557627.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/gisebaripelakilixuzemup.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/zasabuxijemamefogada.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/60871009148.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/zewajodamo.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/72616433477.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/jolajisodimexuluzelojo.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/3179261171.pdfIn PDF document text
    • https://tipresentoio.it/images/file/36504266417.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/kiwurusonifitufoled.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/62185078303.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/verepewijazi.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/taxatukoj.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/sijisebusulobidafi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70cc6dd55---gewejifoxik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=starmaker+sargam+appPDF 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_off0000b816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD028 15836 bytes
SHA-256: dc9af57dc2ea424652ea3e1470e6ec2ca7677a722354a776aea97d024a9b32ce
font_02_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 10400 bytes
SHA-256: 932da65631e8df0a79fd9bab5dd6d234dd971535d36d7f8e78a6ce554d5333cf

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