Malicious PDF — malware analysis report

Static analysis result for SHA-256 c714cd8115d21ed7…

MALICIOUS

PDF

34.6 KB Created: 2020-06-14 13:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ba07983d91f86be8135c39e41fab7a6 SHA-1: d8fc7f35263c5f786b7e99acf9939b90372a1d69 SHA-256: c714cd8115d21ed795220fe7a67e8cf025a8b246cee94e900632148f09038271
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to domains associated with SEO spam or link farms. The document body, though partially corrupted, suggests a lure related to 'Johnson outboard motor troubleshooting guide'. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports the conclusion that this document is designed to redirect users to potentially harmful content.

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://shoplucky17.com/uploads/1/3/1/3/131384567/131384567.html#johnson+outboard+motor+troubleshooting+guide
    • http://bucketsonline.org/uploads/1/3/0/3/130324158/sukafexuxiguvax.pdf
    • http://179.undesirable.us/uploads/1/3/0/7/130775842/df28ea637a.pdf
    • http://mkrepairs.com/uploads/1/3/1/1/131164173/4144774.pdf
    • http://thetribespace.org/uploads/1/3/1/6/131637763/posanesavatebo.pdf
    • http://found-and-lost.com/uploads/1/3/0/6/130604656/3a487a70d1a1.pdf
    • http://jewliesjewels.com/uploads/1/3/0/5/130590482/kutibuvezebudobuwela.pdf
    • http://rosecityinspections.com/uploads/1/3/0/3/130323811/besenogozifazaxezoj.pdf
    • http://countmarketing.com/uploads/1/3/0/2/130289799/tirufatekitu_nigoxudesovopis_fokobafozujisof.pdf
    • http://74-123-79-124.mgwnet.com/uploads/1/3/0/7/130739831/tilikaro_luruwepeda_kokudir.pdf
    • http://theaddcouple.com/uploads/1/3/1/4/131453871/sezox.pdf
    • https://satubawuk.files.wordpress.com/2020/06/78666115103.pdf
    • https://wiwifidu.files.wordpress.com/2020/06/dafibaziju.pdf
    • https://zafukiw.files.wordpress.com/2020/06/kunajelagemudunes.pdf
    • https://mizarexil.files.wordpress.com/2020/06/21199190180.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_off00005d49.bin
366375150de6bac515f8b8347a0c47463437d78e1e47cc7da28ae0d680d4736e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D49 9880 bytes

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