Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc0284865761b46…

MALICIOUS

PDF

45.9 KB Created: 2020-03-07 22:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 62258854ccbb01bdd8a438c299a8bdfc SHA-1: b42cf800a98f04339ec98af29c7e81ec1741b223 SHA-256: 0bc0284865761b460a496d7ff5654ff95b63f0112021740e4208bb81452f8962
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam campaign. The document body, though partially corrupted, contains text related to a medical report, which is likely a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of numerous external URLs reinforces this assessment.

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://fameusfame.com/uploads/1/3/0/7/130775511/130775511.html#rheumatic+fever+and+rheumatic+heart+disease+report+of+a+who+expert+consultation
    • http://riddlefamilyranchgrassfedbeef.com/uploads/1/3/0/6/130639241/lavepolof_nafoxawal_koxuveg_rabasez.pdf
    • http://ninosristorantepizzeria.com/uploads/1/3/0/6/130621032/ad5eb7cb480a4.pdf
    • http://www.mckenziemadeit.com/uploads/1/3/0/5/130551247/jijipimoposur.pdf
    • http://fixingking.net/uploads/1/3/0/8/130874365/93570.pdf
    • http://battlebuilding.com/uploads/1/3/0/6/130639924/wixovibopi_bowuze_wipowapajuveda.pdf
    • http://fixitfowler.com/uploads/1/3/0/4/130489350/zapukisavelamu.pdf
    • http://deliyannides.org/uploads/1/3/0/4/130483277/3347e4.pdf
    • http://webmail.paulearl.co.uk/uploads/1/3/0/3/130379173/fekani_besuze.pdf
    • http://toxicologist-katie-chiang.com/uploads/1/3/0/3/130379458/vuzil-wuforefaxabo.pdf
    • http://www.il-giardino-segreto.com/uploads/1/3/0/8/130873945/togafixididoja-buzitome-simalaxut.pdf
    • http://desatascosbarcelona.net/uploads/1/3/0/4/130476732/0d31f82ba17662.pdf
    • http://www.gaualauf.com/uploads/1/3/0/6/130620565/dcd59988ac4.pdf
    • http://rebeccabevans.com/uploads/1/3/0/5/130589998/5552102.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • 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_off00007a0d.bin
ed784cd9ea1fd91ca3a25203d28d9cac6a2ddf73d48d4364ee53c58c30811f95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0D 2900 bytes
font_01_sfnt_off000085bd.bin
c6cfd4d79060708d41ffbb2ce67aa152d02117388d7c7a81228c7cfd24735e9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BD 8700 bytes

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