Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c720f53e7926ba6…

MALICIOUS

PDF

41.6 KB Created: 2020-04-23 05:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 105691c120974e22b5291048fc00f2b0 SHA-1: b08cb59e29fcdbeb62a8565474cff96e30bc284e SHA-256: 2c720f53e7926ba63c431b2023ca8e884583b112c9af1de6ac8b56a6709bcd41
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 other PDFs hosted on similar domains, indicating a link farm for SEO manipulation or traffic redirection. The document body, though partially corrupted, contains text related to file conversion and mentions 'wkhtmltopdf', suggesting a lure to a website that may host malicious content or phishing forms. The ML classifier strongly flagged this PDF as malicious.

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://otheryou.com/uploads/1/3/0/3/130323186/130323186.html#convertir+formato+cdr+a+jpg+online
    • http://www.lesbonssavons.com/uploads/1/3/0/5/130551754/7c7bfcd5c.pdf
    • http://crownprosperityllc.com/uploads/1/3/1/4/131407704/lusatusomume.pdf
    • http://beautifulminddesigns.com/uploads/1/3/0/6/130620808/82e0b3cf.pdf
    • http://jaysonvarzeli.com/uploads/1/3/0/7/130740258/newerodasu-jifomuk.pdf
    • http://mindfulcare.nl/uploads/1/3/1/4/131437780/towelomiporito_wafoja_difuwakitoj_lufidesipufili.pdf
    • http://dragadosambientales.com/uploads/1/3/1/3/131380999/ruwapurexipilaboj.pdf
    • http://classicar.com/uploads/1/3/1/6/131606279/fc45a8.pdf
    • http://munrocollege.com/uploads/1/3/0/6/130639358/3242751.pdf
    • http://sojir.com/uploads/1/3/1/4/131406809/1923715.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_off0000631a.bin
440c8014f2b0a8eb36bdb69fac8e8fb8e51136ec9eb16c4c81b529d21d20b4bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631A 8944 bytes
font_01_sfnt_off000083e6.bin
a68ad206e6fa00de9a93bcd426264e2a948f22db9431d90be7110a1ae082cbf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E6 16076 bytes

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