Malicious PDF — malware analysis report

Static analysis result for SHA-256 75db9544002f80cd…

MALICIOUS

PDF

38.2 KB Created: 2020-04-02 11:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 122d07b94e63310e49f104049b05455d SHA-1: fee53b9c906f1529d1afb62ec1ab31fe43d2456d SHA-256: 75db9544002f80cdc188770bc498485b36e71d3261390e3347f1bf8d421a90fe
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to other PDFs hosted on similar domains. This behavior is indicative of a link farm or SEO spam operation. The document body text, while partially corrupted, suggests a lure related to 'how to tie a tie' to entice clicks. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

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://taoswellwoman.com/uploads/1/3/1/3/131384568/131384568.html#descargar+video+como+hacer+nudo+de+corbata
    • http://landjspantry.com/uploads/1/3/0/5/130539849/7416737.pdf
    • http://hogo-avocats.com/uploads/1/3/0/7/130739131/dd77ad2df6da9.pdf
    • http://vegandsm.com/uploads/1/3/0/2/130289177/jididokobatelebu.pdf
    • http://exchangestripz4cash.com/uploads/1/3/1/4/131407704/bb0386.pdf
    • http://danielamansfield.de/uploads/1/3/1/4/131406735/judibil.pdf
    • http://atticusfranchise.net/uploads/1/3/0/5/130550723/b679b7d61cc.pdf
    • http://webdisk.rathlawoffice.com/uploads/1/3/0/4/130476332/a0882.pdf
    • http://vatspeak.com/uploads/1/3/0/5/130541116/8505027.pdf
    • http://bitsofyourbeing.com/uploads/1/3/0/7/130739167/gotaramadazepefov.pdf
    • http://resolveoh.com/uploads/1/3/0/6/130639146/e738d3d504975.pdf
    • http://22tozerodogs.org/uploads/1/3/1/1/131164462/juzowexibiz.pdf
    • http://janettsaid.com/uploads/1/3/0/7/130776486/bobalogukuranibipize.pdf
    • http://moustac2b.com/uploads/1/3/1/3/131398020/1c5af6936e24.pdf
    • http://davieslewisdevelopmentltd.com/uploads/1/3/0/7/130740320/pilokigitakesafe.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bff.bin
2d73e42e37a094a9d7c8bcbc0f84323a1446039ed33b4293c5e23c6177e28823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFF 8192 bytes

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