Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3495874413a274…

MALICIOUS

PDF

44.0 KB Created: 2020-04-04 14:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a732ee4bc758b94e933fea7bc02de9dd SHA-1: a4f8e2b0b2ff8fd2df40fb99b5dbac3cd81fac19 SHA-256: 1f3495874413a2748ce8c01aa73bc95ca9b841b37a0e7c9e0a249895180e331a
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of external links, many of which point to PDF files on various domains. The primary URL, http://sculptedbrowsandbeauty.com/uploads/1/3/0/5/130540211/130540211.html#examen+del+primer+trimestre+de+cuarto+grado+de+primaria+con+respuestas, is presented as an academic document but likely leads to a malicious site. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://sculptedbrowsandbeauty.com/uploads/1/3/0/5/130540211/130540211.html#examen+del+primer+trimestre+de+cuarto+grado+de+primaria+con+respuestas
    • http://katherinegaulke.com/uploads/1/3/0/3/130313272/buvuli-bovobanozoduz.pdf
    • http://lakewoodvillageverobeach.com/uploads/1/3/0/7/130739433/zinepotuf_nopupuxute.pdf
    • http://mantraonthemat.com/uploads/1/3/0/4/130488288/6009ad4788a7.pdf
    • http://beardedbadboys-ch.com/uploads/1/3/1/4/131406607/rumagog-mazenexuz.pdf
    • http://shifttolight.com/uploads/1/3/0/7/130740209/0f2d7c78.pdf
    • http://wiesd.net/uploads/1/3/0/6/130604371/temav_toxujet.pdf
    • http://georgetownvineyards.com/uploads/1/3/1/4/131437516/4382598.pdf
    • http://pnxpartners.com/uploads/1/3/0/7/130738732/2200019.pdf
    • http://dynamicsleepconnection.com/uploads/1/3/0/6/130639763/cc49bd049835dc2.pdf
    • http://gathermv.com/uploads/1/3/0/8/130874210/f7cd94a.pdf
    • http://defendersofthecross.us/uploads/1/3/0/8/130814680/3004964.pdf
    • http://abingdoncc.org/uploads/1/3/0/2/130289669/8860360.pdf
    • http://byrdtransportplus.net/uploads/1/3/0/6/130621548/zewuzewuri-javurub.pdf
    • http://nextstephealthcarema.com/uploads/1/3/0/5/130539935/kurabomedonimun.pdf
    • http://philcohomes.com/uploads/1/3/0/6/130621038/8951187.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068fd.bin
b93bef5c40e8c7baad5fde28b79cb397dd7da23091f942fb2e4d67e50fb07b65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68FD 9284 bytes
font_01_sfnt_off00008a15.bin
1d1fa5121415f8f5353993473374918b9d2a38f433752094af4cce5d3be72c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A15 16312 bytes

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