Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a97ab7e1ccebb5…

MALICIOUS

PDF

55.8 KB Authoring application: Pdftk First seen: 2020-09-24
MD5: 64f6136efb7ab14c5b7870dedd15bf92 SHA-1: 53d0a08c794c2449da72b1e1b8af553906a71321 SHA-256: 81a97ab7e1ccebb523ca3cdbe038f304fce71316bbd9a6a81f08e13af8b8e1e4
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to other PDF files, disguised as a video downloader. This technique is commonly used to distribute malware or conduct phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, and the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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.
  • 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://menagainstcancer.net/uploads/1/3/0/6/130604416/jevujub.pdf In PDF document text
    • http://mizfamphoto.com/uploads/1/3/0/2/130287257/66daee389f717ee.pdfIn PDF document text
    • http://adobeforfashion.net/uploads/1/3/0/6/130640231/206cfe020e9f.pdfIn PDF document text
    • http://mylivgrace.com/uploads/1/3/0/4/130483759/taxatajo.pdfIn PDF document text
    • http://collinsmslibrary.org/uploads/1/3/0/6/130621524/nozajutavuwotubaw.pdfIn PDF document text
    • http://vabakes.com/uploads/1/3/0/6/130621322/titafemov-guwaminezofen.pdfIn PDF document text
    • http://jogekebe.paradise-hotel.ru/uploads/2020/01/28/8041908.pdfIn PDF document text
    • http://soloporque.org/uploads/1/3/0/4/130483393/3376ad9f75ee.pdfIn PDF document text
    • http://nicholemannion.com/uploads/1/3/0/6/130620605/9875897.pdfIn PDF document text
    • http://acouturelife.com/uploads/1/3/0/6/130640219/130640219.html#vidivodo+video+indirmeIn PDF document text

Related samples 1

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000115e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E 10572 bytes
SHA-256: 21d4bb5f88774ae53314e054cc497a215e01dd3a956c6cdd8dc95e2153b65ffb
font_01_sfnt_off00009ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA8 3344 bytes
SHA-256: e5cd680e938c034b3565b94c2d7890809ff1349cd1471179b5e6f4d6d1835b9e

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