Malicious PDF — malware analysis report

Static analysis result for SHA-256 03df0d040132b20f…

MALICIOUS

PDF

39.1 KB Created: 2020-03-21 14:08:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e6099f076b776501c50397594817b982 SHA-1: 4f257cb96c0dd146c31981c62a725e244a8d8f89 SHA-256: 03df0d040132b20fad892773e849c2a0ce935eae8ba359391cbf8fde6acde320
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. This pattern is indicative of SEO spam or a link farm designed to distribute malicious content or manipulate search engine results. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://madebyclaireb.com/uploads/1/3/0/5/130543155/130543155.html#norelco+electric+replacement+blades
    • http://autodiscover.dianeunderhill.com/uploads/1/3/0/7/130776520/bujif.pdf
    • http://informationsuperglacier.net/uploads/1/3/0/2/130291555/tezigupagotu-furimugaju-libuserut-wixututexodud.pdf
    • http://randomfisherman.com/uploads/1/3/0/6/130604487/3308006.pdf
    • http://mixedattainmentteaching.com/uploads/1/3/0/5/130588334/rarenusow-pulizupiledad-fomarovepizoz.pdf
    • http://stoneforcepavingandmasonry.com/uploads/1/3/0/6/130621258/7771740.pdf
    • http://www.jumboloansnw.com/uploads/1/3/0/6/130639061/gugaxajibufokunosi.pdf
    • http://www.santeart.org/uploads/1/3/0/4/130483265/mizuwerexo-demito-doxogoforidu.pdf
    • http://zhizunzhenrenyule.br3h.com/uploads/1/3/0/6/130604928/kudixo.pdf
    • http://www.wc1usd.com/uploads/1/3/0/4/130490776/tafilulejaridibus.pdf
    • http://www.coloradofishtaxidermy.com/uploads/1/3/0/4/130476047/zukofekalun_paxeratezagak_jubof.pdf
    • http://lilahbazarte.com/uploads/1/3/0/5/130589452/sotimiwajizu_nuwogew_maxodono_givajivef.pdf
    • http://transformationspersonaltraining.com/uploads/1/3/1/1/131163658/1067872.pdf
    • http://jasonchou.net/uploads/1/3/0/5/130590673/wulefamaf_somegepikinaduv_linokodilolix.pdf
    • http://wedodirectorsandofficersinsurance.com/uploads/1/3/0/5/130538923/bisagifes.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cbe.bin
87069326149ab6e5268f238adda94ea28b48abb1642dcce1cac8a424474a13bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBE 7492 bytes
font_01_sfnt_off00007a2b.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2B 16036 bytes

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