Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdafa95a1ca44678…

MALICIOUS

PDF

31.4 KB Created: 2020-05-15 03:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c52950a7024291966b58015b4016391 SHA-1: e17595eebdeb3a37276f098821e8f379c98bec0f SHA-256: cdafa95a1ca4467899f6fcbeef6b685e42e5a3df98572734daf3ef0c44f4c862
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains text related to a 'Bosch microwave service manual', likely a lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://promisso.org/uploads/1/3/0/4/130483294/130483294.html#bosch+microwave+service+manual
    • http://plussizebridaldressesma.com/uploads/1/3/1/1/131163733/5025930.pdf
    • http://dueoutdoors.com/uploads/1/3/0/2/130291551/2009099.pdf
    • http://deweydaycamp.com/uploads/1/3/0/2/130273743/2749421.pdf
    • http://texastwistfastpitch.com/uploads/1/3/0/4/130483429/9810369.pdf
    • http://srilankacollegeof.org/uploads/1/3/0/7/130775515/xefigikoseboki_winime_polatabakisuwo_sogozoruliw.pdf
    • http://mydonutbarn.com/uploads/1/3/1/0/131070302/5317d31192928b.pdf
    • http://fazendamosa.com/uploads/1/3/0/9/130969441/64c24c58930a8e.pdf
    • http://thestickermill.com/uploads/1/3/1/6/131637024/radidetejegimedapilo.pdf
    • http://jofcompany.com/uploads/1/3/1/6/131636862/a82fbda0a78a.pdf
    • http://thebestbeerprices.com/uploads/1/3/1/8/131872104/0372c.pdf
    • http://joyceanddonny.com/uploads/1/3/1/6/131606803/eb9a5242a.pdf
    • http://1200southmadison.com/uploads/1/3/0/6/130621335/ponibuve-ratozivibujefi-nomoxuzagez-fesipuzuxa.pdf
    • http://johnmaanumod.com/uploads/1/3/0/6/130605176/kidek.pdf
    • http://wafflemeup.com/uploads/1/3/1/3/131380618/0bb25.pdf
    • http://stayingsafe.be/uploads/1/3/0/5/130539095/9558223.pdf
    • http://mountaintherapygroup.com/uploads/1/3/1/6/131636700/rufubozufa.pdf
    • http://netherhaughfarm.com/uploads/1/3/1/4/131437198/3371833.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_off0000522e.bin
36e042d84b8e9c2a47bae9653c6bf232f69bf4292f7b0d5f9a43a9e7985be7a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x522E 9304 bytes

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