Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbde100f8c737bf…

MALICIOUS

PDF

39.2 KB Created: 2020-04-02 09:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 18fbb6cfc00a2a81b37c7b0dc2f06a44 SHA-1: 397cfea79accd1a9f019301b2dd5378550279a1f SHA-256: dbbde100f8c737bf1a9cf0966649100e9f96b1f22e34c326ac96805d26ed2747
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body text, though partially obfuscated, includes a reference to 'Sermones adventistas para predicar los miercoles' and the authoring application 'wkhtmltopdf', suggesting a lure to attract users to these linked pages. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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://livelivelylifecoaching.com/uploads/1/3/0/4/130483370/130483370.html#sermones+adventistas+para+predicar+los+miercoles
    • http://danceitoutgirl.net/uploads/1/3/0/6/130604740/8a423.pdf
    • http://bipolarstarguide.com/uploads/1/3/1/4/131407511/f1eab05c251d1.pdf
    • http://akkinam.org/uploads/1/3/0/5/130550762/zemuvunonoxisewe.pdf
    • http://sno-ops.net/uploads/1/3/0/8/130813108/salizugil-kesan.pdf
    • http://guardianmortgagegroup.com/uploads/1/3/0/2/130272644/jawumovefabuw.pdf
    • http://tiesthatbindstore.com/uploads/1/3/0/3/130312953/sebudu-senaxobobemobop.pdf
    • http://billrobards.com/uploads/1/3/0/7/130775278/vabemaxekag.pdf
    • http://noplacelikeahome.com/uploads/1/3/0/4/130435711/rideripuvid-bubamopaj.pdf
    • http://opiatefreemeds.com/uploads/1/3/0/7/130739578/2359005.pdf
    • http://windroseint.com/uploads/1/3/0/8/130814258/652c1a21b2270d.pdf
    • http://brokerdailyblog.com/uploads/1/3/1/1/131163857/jadogivevatamenewe.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_off00006e04.bin
6ee892d2440f3ef5525d0739f1daf1374596a7d6781d2d1a43f6b833c1945d45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E04 9572 bytes

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