Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf350d3dbfb12b83…

MALICIOUS

PDF

84.1 KB Created: 2020-12-27 16:06:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d661d389167f48aea7bcb9c9d7fa31e7 SHA-1: 6fcbdf41f02c8a67d74d2477ab459dd87c90c48c SHA-256: bf350d3dbfb12b834c96101cfc75e8349bf2b4b2860042b290c48e9ee489363f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the ClamAV detection as Pdf.Phishing.Trojan indicates a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=alt+codes+allowed+in+wow
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/bdb542a6d217.pdf
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/1289421.pdf
    • https://xugilatopuke.weebly.com/uploads/1/3/4/7/134746985/1717149.pdf
    • https://rujijixagav.weebly.com/uploads/1/3/1/3/131383475/wenukolilakigo-dibegugusuwexo-lubezosibogaxin.pdf
    • https://cdn-cms.f-static.net/uploads/4413563/normal_5fa2293f3cf7e.pdf
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/jutilotew_jemew.pdf
    • https://xebuwonivaxatev.weebly.com/uploads/1/3/2/6/132696015/1daeb1893e9b18e.pdf
    • https://static.s123-cdn-static.com/uploads/4484633/normal_5fe097694970c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/785cdce2-e407-4fa1-b472-c1e901651357/vocal_lessons_near_me_prices.pdf
    • https://uploads.strikinglycdn.com/files/da300a10-9fe7-40b7-9714-e320a9995412/1037217931.pdf
    • https://s3.amazonaws.com/mawesenasijoser/zejesunotadem.pdf
    • https://uploads.strikinglycdn.com/files/8bb903fa-d98d-4a5e-81b6-c9dbbfbeac9e/matonerajemutulupewuj.pdf
    • https://uploads.strikinglycdn.com/files/010d0d47-4796-48db-bd18-5fa9de5a3441/schaumburg_high_school_rating.pdf
    • https://s3.amazonaws.com/jiguwuzobozobaz/guxatugawimedipiko.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31f.bin
f109ad6c16ceb01b4cb07c6e66b1809ba838231517305fffa684e1e7592a926f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 4920 bytes
font_01_sfnt_off000103ff.bin
d110c4bd308f38465b845c95a91f80068355ffdedce9de9d3bb406322161ba6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 23680 bytes