Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fb9e989584f996…

MALICIOUS

PDF

61.2 KB Created: 2020-03-29 14:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 423465aa47bb996884943f159406f1a3 SHA-1: 5be17ac3b651ed16a45de4a32a7b9e180ebbc4a8 SHA-256: 64fb9e989584f99670f4a70ca7495a44dab6cc0a28fc29ffd6cc102b744ac70a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or content distribution scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect users or manipulate search engine results.

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://beyoujewelrymn.com/uploads/1/3/1/3/131381450/131381450.html#cual+es+relieve+de+asia
    • http://robertletstalk.com/uploads/1/3/0/5/130551378/2884b3055.pdf
    • http://warriorchefsf.com/uploads/1/3/0/9/130969363/ff485cb6.pdf
    • http://kodiaksyle.com/uploads/1/3/0/2/130291712/987269.pdf
    • http://mjlocating.com/uploads/1/3/0/4/130435947/tidovivukof.pdf
    • http://theradventure.net/uploads/1/3/0/2/130289625/6009024.pdf
    • http://cmfindlay.org/uploads/1/3/0/7/130775741/pinuvuwupa.pdf
    • http://unwind-bbco.com/uploads/1/3/0/7/130738939/7518183.pdf
    • http://pareandtrast.com/uploads/1/3/0/3/130379844/zimagibukido.pdf
    • http://terindevoto.com/uploads/1/3/0/8/130813420/1c56ba3486.pdf
    • http://altamonteballers.com/uploads/1/3/0/2/130272281/1213987.pdf
    • http://abra-maquillos.com/uploads/1/3/0/9/130969764/rupivolafalig.pdf
    • http://leangreenlab.com/uploads/1/3/0/8/130873860/mefibarabona.pdf
    • http://sippinthebeergossip.com/uploads/1/3/0/7/130738679/nilazidenaxuda.pdf
    • http://capefearcards.com/uploads/1/3/0/5/130590159/ruwunalopuwizipa.pdf
    • http://divebee.com/uploads/1/3/1/1/131163851/setopo.pdf
    • http://heart2handscpr.com/uploads/1/3/0/2/130288540/pisovi.pdf
    • http://safecleanasc.com/uploads/1/3/0/4/130478602/9060f3495d.pdf
    • http://christian76.com/uploads/1/3/0/2/130273789/bosalevudirigi.pdf
    • http://markhmccormack.com/uploads/1/3/0/2/130289613/87d8a71998808.pdf
    • http://fully-booked.net/uploads/1/3/1/3/131379555/684f4644556a.pdf
    • http://nannina1925.com/uploads/1/3/0/6/130603900/bapufeborimazel.pdf
    • http://encounteratl.com/uploads/1/3/0/7/130739891/taxowopex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a1d4.bin
79e66eeb25f95b3f59e4a99280b5a799c63c594d58e3767542731d5593629326		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D4 10212 bytes
font_01_sfnt_off0000c5e4.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 2652 bytes
font_02_sfnt_off0000cf4b.bin
fddb20c146134621abaa99e81e1487c59140a8d66dfac1d41f6a0e08b4af10df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 16080 bytes

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