Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e81688ac9abbe0…

MALICIOUS

PDF

64.6 KB Created: 2020-04-21 02:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bfdca2dc799b9ef19d1bdca643bdf753 SHA-1: 8b7b2a45b50f19b519ec13d450c4151c661aae5e SHA-256: a1e81688ac9abbe0c9aae1ebc5d480a8ba6e487a0f75a1e3effc4f7d9418e2b8
92 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'Sherlock holmes all books pdf' and references wkhtmltopdf, suggesting a lure to download or view content from the linked URLs. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9674

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://easyfreelegal.com/uploads/1/3/1/4/131452732/131452732.html#sherlock+holmes+all+books+pdf
    • http://soida.net/uploads/1/3/0/8/130814805/xogisat_dafarokugofop_zojoxiwowi_kojumeputeve.pdf
    • http://sidetracks-newzealand.com/uploads/1/3/1/3/131381443/b0660e1aa0.pdf
    • http://marysnails.org/uploads/1/3/0/5/130550781/3185641.pdf
    • http://zsecond.net/uploads/1/3/0/4/130476429/vimozos.pdf
    • http://mountainxllc.com/uploads/1/3/0/6/130605048/4eb8dca7530.pdf
    • http://honestguy.info/uploads/1/3/1/3/131380583/milog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069d7.bin
429b7fbf2e2f764beec87f3408d78221433ce0f4e9f64a239e9bb6b93db6df89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D7 7832 bytes
font_01_sfnt_off0000880f.bin
a106c8aead8cfc42e0b6831661aff33d53d1ea3a1715e29464c2c6a738f0bd2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x880F 44180 bytes
font_02_sfnt_off0000e1a7.bin
ca889182d22413b1a5b6446cd5d954c095bfc2c8b2fec1022b19199100617195		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 16028 bytes

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