Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb695586fbeab6e9…

MALICIOUS

PDF

49.1 KB Created: 2020-03-09 09:31:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1ec140827de3a5899e15fb234e7abe29 SHA-1: c6d74ec5050cac316283d1d43bb8f4184ee27350 SHA-256: cb695586fbeab6e98b6e01d14d6db51864e48c2f73a2c88397dfd56809a581b3
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, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded links likely serve to redirect users to malicious websites or to distribute further malware, fitting the pattern of a link farm or SEO spam attack. 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://29.bpmtc.com/uploads/1/3/0/6/130620505/130620505.html#capitalism+communism+socialism+anarchism
    • http://pcbaugh.com/uploads/1/3/0/5/130551692/feguvofu-ligujivu-zubunojupupon-zotudiwemofu.pdf
    • http://www.rebeccahigginson.com/uploads/1/3/0/9/130969972/8127780.pdf
    • http://digitalvitamininc.com/uploads/1/3/0/7/130776371/nolaveze.pdf
    • http://runwildandbe.com/uploads/1/3/0/3/130313122/gokulamutojib-xikapopumisaled-setitejut.pdf
    • http://readingforliberation.com/uploads/1/3/0/6/130621290/4223742.pdf
    • http://stimsonbay.com/uploads/1/3/0/5/130550792/dajeban-pipoj.pdf
    • http://12lettersfromsanta.com/uploads/1/3/0/3/130312985/3e90ba.pdf
    • http://woodstreamga.com/uploads/1/3/0/7/130775379/5157122.pdf
    • http://www.minnesotaturfpros.com/uploads/1/3/0/4/130483862/zopuxixifi-taveneb-dunafevekum.pdf
    • http://worldofmuseumships.com/uploads/1/3/0/5/130589123/b9a14e4aca0ac6.pdf
    • http://gameofthronesofmuppets.com/uploads/1/3/0/4/130476652/zaxofujorugisab.pdf
    • http://woohoothings.com/uploads/1/3/0/6/130621240/zobupegugaw.pdf
    • http://pediatricwellness2019.com/uploads/1/3/0/6/130604737/rakabosujumesisorofe.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_off00008294.bin
65babf1b2a27cf8c71287bcd7553d7c48cce2f29c62880b76856ab1466efcbd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8294 8036 bytes
font_01_sfnt_off0000a146.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA146 16204 bytes

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