Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f37818fd9ba05ca…

MALICIOUS

PDF

52.1 KB Created: 2020-06-16 07:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 9ccc0087ebc12ae3c70ae0e8091878da SHA-1: 691ca7cc062e4aac9140ed5e96c9cd779657759a SHA-256: 0f37818fd9ba05cadd7a8f3c0a60370503025bfd838fe64b907bd74883aebb27
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to suspicious domains and appear to be part of a link farm designed to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a malicious intent to redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://4qn.undesirable.us/uploads/1/3/2/6/132683040/132683040.html#information+strategy+pdf PDF link annotation
    • http://miruviewphotography.com/uploads/1/3/1/8/131856277/lunipiduxuzesukavox.pdfIn PDF document text
    • http://no720.com/uploads/1/3/0/4/130488476/ba9883ee3.pdfIn PDF document text
    • http://3or.undesirable.us/uploads/1/3/0/5/130539696/1458358.pdfIn PDF document text
    • http://kjhgtw.com/uploads/1/3/0/6/130620366/vibosofupijujo.pdfIn PDF document text
    • http://brewtalhoonesttrooth.com/uploads/1/3/0/3/130323155/8577963.pdfIn PDF document text
    • http://lauriebaron.net/uploads/1/3/0/8/130874431/2278237.pdfIn PDF document text
    • http://facelabskincare.com/uploads/1/3/0/6/130604689/nosaziketa.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA197 10512 bytes
SHA-256: 5ece1a9e81d5a5a9a62c4fb872fdb19b4f8b9a90827d0c6695fd61de2e52106d

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