Malicious PDF — malware analysis report

Static analysis result for SHA-256 d722c42fa34fb073…

MALICIOUS

PDF

33.5 KB Created: 2020-06-04 07:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20b13e6919af49f4b9a8d8ccbbf9fae8 SHA-1: e4231a23fd2abad2b4138cbf4324da25075d0dbe SHA-256: d722c42fa34fb07365bb3326f95f29bf2dfe29b80c72e190f2165a019f1830d8
96 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, many of which point to other PDF files hosted on various domains. The document body and embedded URLs suggest a lure related to 'free music downloads' to entice users to click on these links. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to host malicious content. The ML classifier strongly flagged this PDF as malicious.

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://mta-sts.mail.wedoofficeinsurance.com/uploads/1/3/1/0/131070627/131070627.html#jessie+j+mp3+songs+free+download
    • http://mfgcsi.com/uploads/1/3/0/5/130540284/zanisirolamom-togifo.pdf
    • http://lucretiabingham.net/uploads/1/3/0/6/130604633/5075539.pdf
    • http://female.mediutopia.com/uploads/1/3/0/6/130604359/memuxuxatetovekiro.pdf
    • http://mta-sts.mail.wedoofficeinsurance.com/uploads/1/3/1/0/131070627/terms.html
    • http://mta-sts.mail.wedoofficeinsurance.com/uploads/1/3/1/0/131070627/dmca.html
    • http://mta-sts.mail.wedoofficeinsurance.com/uploads/1/3/1/0/131070627/policy.html
    • https://nasiwulevil.files.wordpress.com/2020/06/pezujomoberibe.pdf
    • https://koxowite.files.wordpress.com/2020/06/77119885630.pdf
    • https://wenowugig.files.wordpress.com/2020/06/86687076710.pdf
    • https://rozipinofoti.files.wordpress.com/2020/06/76580014469.pdf
    • https://zaferogo.files.wordpress.com/2020/06/39344779767.pdf
    • https://nokoronujo.files.wordpress.com/2020/06/38159611066.pdf
    • https://pikudava.files.wordpress.com/2020/06/banifijevusifiva.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_off000055bc.bin
9eb6a3e58ef9558b58a680e0d21ec2172208e2aa3f4de18c116ba626104163db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55BC 10752 bytes

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