Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f86dd7896d1055f…

MALICIOUS

PDF

48.4 KB Created: 2020-04-03 06:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 382eeca09115d04bd435cd74105f5e39 SHA-1: c98b77e6981b8dab5d27b32653ab293f9c4b75ce SHA-256: 4f86dd7896d1055fa69e274627d8ef357051ee4d7efadbe82a7a8e7f0b6912f9
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a tactic to drive traffic to a network of potentially malicious or low-quality content sites.

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://impact-active.com/uploads/1/3/0/2/130271058/130271058.html#que+es+el+salazon+de+alimentos
    • http://brownsburgcarwash.com/uploads/1/3/0/2/130271087/dorinozaramig.pdf
    • http://chriscamire.com/uploads/1/3/0/7/130776249/vovofasukog.pdf
    • http://neublue.com/uploads/1/3/1/0/131069893/6128587.pdf
    • http://shastacountymountainproperties.com/uploads/1/3/0/6/130639231/4171560.pdf
    • http://3hhairstore.com/uploads/1/3/1/3/131380511/nipomavopig-mibaxaf-jekupavasidotef.pdf
    • http://michaelvincentmagic.com/uploads/1/3/0/5/130589194/e749f.pdf
    • http://noellecavenaughyoga.com/uploads/1/3/1/4/131482957/d6996b.pdf
    • http://bellacalore.com/uploads/1/3/0/6/130640199/07c117a978f.pdf
    • http://kersteninc.com/uploads/1/3/1/3/131383657/1062443.pdf
    • http://pcdsing.com/uploads/1/3/0/6/130639887/d274f704364f9aa.pdf
    • http://motivationalresearch.org/uploads/1/3/0/6/130604397/gozilunek.pdf
    • http://newwatersgroup.org/uploads/1/3/0/6/130620691/wanilulularedavura.pdf
    • http://cozybagz.com/uploads/1/3/0/2/130272250/lodifugozefeso-fexubi.pdf
    • http://e3events.net/uploads/1/3/0/6/130621371/sawaradorakemepopijo.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_off00007db3.bin
7197e72c61849b2db4bee17d2fb197dc856c8d55cbbc90a265a37aedb23db01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB3 9416 bytes
font_01_sfnt_off00009e9a.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E9A 16204 bytes

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