Malicious PDF — malware analysis report

Static analysis result for SHA-256 790371f339ea2ebf…

MALICIOUS

PDF

48.0 KB Created: 2020-03-30 02:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 296ad0144dd8fcf8fb9dd44b89bc4d92 SHA-1: 9f496d46de111967dfda5412a73a25e239474102 SHA-256: 790371f339ea2ebf9f1b079fc82cb4793d146d7c2ef28641401364efafd52209
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to similarly structured URLs on different domains. The document body, though partially corrupted, includes a title related to drawing a butterfly's metamorphosis and mentions wkhtmltopdf, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of it being used for malicious redirection or hosting further malicious content.

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://adsl-63-204-18-60.benefitplans.org/uploads/1/3/1/4/131437940/131437940.html#metamorfosis+de+una+mariposa+para+dibujar
    • http://yuanhl.com/uploads/1/3/0/4/130476581/kumuforexare-bowuporewo.pdf
    • http://mennalaw.com/uploads/1/3/0/6/130639092/kupezo.pdf
    • http://nvui.org/uploads/1/3/0/3/130313242/9794134.pdf
    • http://sometimesagirlsjustgotta.com/uploads/1/3/1/1/131164171/3554778.pdf
    • http://wearedycon.com/uploads/1/3/0/5/130543276/gajugosofuk.pdf
    • http://artsforactfineartauction.com/uploads/1/3/1/3/131383269/meruwal-ruxeno-bipotulebur-bolebalafesuze.pdf
    • http://bigcitystrangers.com/uploads/1/3/0/5/130542866/67061eb3fbe812.pdf
    • http://lighthouseyarn.com/uploads/1/3/0/6/130605074/zozudupijav_mubol_dasupukufowo.pdf
    • http://thegoudreaugroup.com/uploads/1/3/0/8/130813668/nazerad.pdf
    • http://regalbathandbody.com/uploads/1/3/0/5/130551434/tokubogudu.pdf
    • http://elizabethknaubviola.com/uploads/1/3/0/6/130620209/sofesemid.pdf
    • http://starfruitdigital.com/uploads/1/3/0/7/130776854/7978208.pdf
    • http://milieu-art.com/uploads/1/3/1/0/131071299/napeti.pdf
    • http://besideyou.love/uploads/1/3/1/0/131070307/2ed78dd5.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_off0000933f.bin
b05b53e164b28e397ef351f24ee679b05375c95d37789d49892760456e31a585		 pdf-font-stream PDF embedded font (sfnt) at offset 0x933F 8088 bytes

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