Malicious PDF — malware analysis report

Static analysis result for SHA-256 057ca370bd621680…

MALICIOUS

PDF

34.3 KB Created: 2020-04-13 05:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-12-25
MD5: b0697fe88679ffe86ad4158d2ebe2e79 SHA-1: aa4c93570445dc77353d2dd4c7e760df420b1d52 SHA-256: 057ca370bd6216806d012bc9a41bb16c34b74871ce1e9d305e6f8ce5dfd937bd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or content distribution scheme. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to a network of external resources, potentially for SEO manipulation or to serve further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://robertdoddato.com/uploads/1/3/0/7/130738716/130738716.html#jugar+aprendiendo+a+leer+con+pipo+gratis PDF link annotation
    • http://mariannelima.com/uploads/1/3/0/6/130620838/213fb.pdfIn PDF document text
    • http://seananetsberger.com/uploads/1/3/0/4/130483592/gugosafapela.pdfIn PDF document text
    • http://fordbyrdconsulting.com/uploads/1/3/1/4/131452811/baxowug-pojugavabedow-sejabexizogofo.pdfIn PDF document text
    • http://prettygirlz.org/uploads/1/3/0/7/130738752/de6b798ae17bc.pdfIn PDF document text
    • http://docsquads.org/uploads/1/3/1/4/131454452/zusoliwededurel-tiwinovowupow-pozufirexepil.pdfIn PDF document text
    • http://juliarwilson.com/uploads/1/3/0/6/130605174/4376212.pdfIn PDF document text
    • http://cassidy.website/uploads/1/3/0/6/130604177/sofatawoxuz.pdfIn PDF document text
    • http://christianathlete.net/uploads/1/3/0/4/130478772/fukizav-pefedifogi-pokek.pdfIn PDF document text
    • http://bridgepilateswa.com/uploads/1/3/1/6/131636984/dujubamivoni.pdfIn PDF document text
    • http://sweetbeachtravel.com/uploads/1/3/0/6/130621200/3280d23d9ca9.pdfIn PDF document text
    • http://sanctuaryofearthangels.com/uploads/1/3/0/2/130272233/903549.pdfIn PDF document text
    • http://historichomelife.com/uploads/1/3/1/4/131452818/sudevapajaxelo.pdfIn PDF document text
    • http://gregtrisforkids.com/uploads/1/3/0/7/130739301/lenuw.pdfIn 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5930 9304 bytes
SHA-256: 661d798b47c99d7a8bffd3b709dc5b6ee394d8f6810cccb42fc9b4a3ef9824f6

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