Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa82914a4007c51…

MALICIOUS

PDF

75.2 KB Created: 2021-02-07 17:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 07fda5d5f5dcd0b05b3b39b8e6dc4d8c SHA-1: c6fe75bdcdabd84e9f3cbf2ff00b2408a938ae1b SHA-256: 7aa82914a4007c51c9d05c234ce5fa640b8abda59dcdfcc6be3a6cdaf06783d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external, potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to redirect users to various potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://jacksth.ru/wb?keyword=explosions%20in%20the%20sky%20discography PDF link annotation
    • http://mebesovinu.22web.org/gudunezewufukefibebilon.pdfIn PDF document text
    • http://godubumoze.iblogger.org/lonetufomivofud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487632/normal_601fd84dc9c0c.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/femaveneximobo_puxuruwelevob_voxuwuv_mazunowuzifuxom.pdfIn PDF document text
    • https://kumajevebak.weebly.com/uploads/1/3/1/8/131856027/zamokulilukaga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506200/normal_6002ea677be7a.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/benoridotetu-topimod-nubawofozabu.pdfIn PDF document text
    • http://kokusurajiguz.22web.org/84204323189.pdfIn PDF document text
    • http://pukogika.iblogger.org/40594310901.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 5528 bytes
SHA-256: 86280fba08cddcf67cc78095072e6ced584cb3c15fc37486b0b092d90866fd11
font_01_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 11440 bytes
SHA-256: b37fee2d298d7af4cd7c2ff48336f27d529ee99c974654cad710445fe36d4dd5

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