Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd4dcb02278f714…

MALICIOUS

PDF

36.6 KB Created: 2020-03-08 02:07:53 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c9275ea7a9b9f3ca5ce2655eb5497785 SHA-1: af8f841fb29cd2ccd738d07f13ab5dd6f2feb88c SHA-256: bcd4dcb02278f7148d329ed1872007aa6af99f2f19ec885687c3dd6706a0c22a
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to 'Nch software pdf to word converter' and numerous URLs, suggesting a lure to a malicious website.

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://occonciergepsychologist.com/uploads/1/3/0/5/130545932/130545932.html#nch+software+pdf+to+word+converter
    • http://familyfoltz.com/uploads/1/3/0/3/130323403/zofukuj-samurubegop.pdf
    • http://www.seahorsed.com/uploads/1/3/0/6/130639746/9b063883644424.pdf
    • http://wisconsinlimousin.org/uploads/1/3/0/7/130740212/85335e6d12.pdf
    • http://jillmansfieldinteriors.com/uploads/1/3/0/5/130547142/modisug-nuxuwira-vixelavavejose-tefoxanofapopo.pdf
    • http://bhpmedicalconsultants.com/uploads/1/3/0/2/130272902/72dc0.pdf
    • http://humanonaplanet.com/uploads/1/3/0/7/130739778/e4c1b.pdf
    • http://juujeeelectronics.com/uploads/1/3/0/8/130873894/7015082.pdf
    • http://easyrealestatewebsites.com/uploads/1/3/0/6/130604649/bejejekozamipex_sepazovixeg_metodamebulonex.pdf
    • http://www.a1-ability-empowerment.org/uploads/1/3/0/2/130289375/8686367.pdf
    • http://davebecker.org/uploads/1/3/0/8/130813997/9770642.pdf
    • http://michaelroll.net/uploads/1/3/0/5/130589042/d4925e.pdf
    • http://madagascar3thegame.com/uploads/1/3/0/7/130775570/395a191dacc7.pdf
    • http://mta-sts.mail.raviparmar.com/uploads/1/3/0/7/130739470/38d620.pdf
    • http://cakeinaboxco.com/uploads/1/3/0/4/130476589/menatix_josejen_xopojadiso_geninasa.pdf
    • http://yogawithkai.com/uploads/1/3/0/2/130291589/joladuwanexunixar.pdf
    • http://crankworthymusic.com/uploads/1/3/0/6/130639398/9216119.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_off000068fa.bin
44fdf4fb1473b043ce3536d75ddb025accc88e40202d0e75ab1351568a827d03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68FA 7176 bytes

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