Malicious PDF — malware analysis report

Static analysis result for SHA-256 91198674b0adba87…

MALICIOUS

PDF

135.4 KB Created: 2020-04-19 04:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 035807581e3221ede9a1c0f6e85eeae2 SHA-1: f994a674a6a9c48231c405373e2336b6deff9bc3 SHA-256: 91198674b0adba874b1ad162938511561b48237b36e30d41e6762a39311e3abb
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which are dynamically generated and point to domains that appear to be part of a link farm. The document body suggests a lure related to an 'answer key', which is a common tactic for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://walldo.com/uploads/1/3/0/7/130738638/130738638.html#fce+successful+practice+test%28+2015+answer+key
    • http://anticracker.com/uploads/1/3/0/4/130478009/4fc9ea.pdf
    • http://babypassiondoula.com/uploads/1/3/0/6/130639607/nipigazabegab_nedipi_jefizivop.pdf
    • http://wtcswiss.eu/uploads/1/3/0/7/130740338/xufajer.pdf
    • http://levelchannel.com/uploads/1/3/0/6/130639236/tokabijit_lufujuritipapa_bisegoravip.pdf
    • http://informai.org/uploads/1/3/0/6/130604518/dasutezat_xasosibil.pdf
    • http://theinkedangel.com/uploads/1/3/0/8/130814754/dilizakivad-jibufesovuzib-zidut-tovimagu.pdf
    • http://guitarhugs.com/uploads/1/3/1/6/131637951/lezava-petetatelepa-wakibewojevuzeb.pdf
    • http://claystuffauthor.net/uploads/1/3/0/6/130639531/a669e.pdf
    • http://worthywonderwomen.com/uploads/1/3/0/4/130476912/758aaa0ae0a68.pdf
    • http://southerngrace256.com/uploads/1/3/0/7/130739573/7283327.pdf
    • http://chestpaindoctor.com/uploads/1/3/0/7/130775940/4867209.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_off0001e02a.bin
3837cff3f694e142aa6e59e458586a315f8a7edb5785244bc4fc692c9b183c28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E02A 10264 bytes
font_01_sfnt_off000204ed.bin
bb66d78edca8aa75a8db461931e44ad6eab12e4cd439df836d92d13c6ef6c22d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x204ED 2668 bytes

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