Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a943cd12a12a9d5…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 02:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: ce408cd204e3f6d705ce72381ca6881b SHA-1: 87f29d605008f7fe5a405dedda14a0da2bca4905 SHA-256: 3a943cd12a12a9d5899d7d95df9db28ad8d0eae50262bef9557fe0eb63ae8fd7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. 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 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://carlaschroyen.com/content_docs/boralajemewela.pdf In PDF document text
    • http://abwingsmd.com/uploads/files/temewimesilum.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/37244289501.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/duvejedalejenede.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/25286403190.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/85301971450.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/25207584696.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/jilobusutijuxotu.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/14964685964.pdfIn PDF document text
    • http://ossokahve.com/upload/file/joxoza.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/21881338295.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/31573848291.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/96217379521.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/rilaxabajemaburasodu.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109110225408640.pdfIn PDF document text
    • http://benetalent.com/upload/files/33547532341.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/75930238999.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/tinukexomutogatekifumilop.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/nadobaritotov.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/20344122803.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/vosuxoxirufoposofazi.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/7855440750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=transformers+dark+of+the+moon+game+download+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_off0000becc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECC 17460 bytes
SHA-256: 1381995c4121a29a74eee8a96327920bd5c2f91f9211c67a7af96d14ed1b6d20
font_01_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 10992 bytes
SHA-256: 36637a3bc0662bd54468c41a526a82f492daedd09677cd291aa8691e0fdca6ec

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