Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e41a7cacc35a29…

MALICIOUS

PDF

71.0 KB Created: 2020-06-06 12:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c983938ddf0de00301a9df1b3cd00e10 SHA-1: ce22792b83d358547ee5011cc436ef604fb59562 SHA-256: 13e41a7cacc35a29ebf5b45f5174e90de1714e803ccc5427ebba5fa5f26cb190
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to host malicious content or distribute further malware. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://xtwdn6.brdge.org/uploads/1/3/1/0/131070355/131070355.html#essential+oil+user+guide+pdf
    • http://novagentechnologyinc.com/uploads/1/3/0/2/130271023/notajabigedirobamiru.pdf
    • http://popsup.org/uploads/1/3/0/6/130604046/575531ac1e.pdf
    • http://mx.stirlingsprings.com/uploads/1/3/1/3/131379944/fojumamo-fawol-zazak-peredomiseguvu.pdf
    • http://mrsduganshomeroom.com/uploads/1/3/0/4/130436085/vabozulufidenul.pdf
    • http://ethosacademy.org/uploads/1/3/0/8/130874011/xufago-wimogi-jidenoradalo-getipak.pdf
    • http://grandparentguide.net/uploads/1/3/0/8/130814871/rodugow_dorokufos_zerobiwexupenal_kebotokekasa.pdf
    • http://informationforhomebuyers.com/uploads/1/3/1/4/131437833/1a60b3.pdf
    • http://summerreignmusic.com/uploads/1/3/0/5/130551564/vimedojok_fiwasopego.pdf
    • http://lunaroce.com/uploads/1/3/1/1/131164261/1010830.pdf
    • http://74-123-73-162.mgwnet.com/uploads/1/3/1/4/131406502/7481503.pdf
    • http://beautifulsoulconnections.com/uploads/1/3/2/3/132303001/favurodobumul-zavakuloz.pdf
    • http://xtwdn6.brdge.org/uploads/1/3/1/0/131070355/terms.html
    • http://xtwdn6.brdge.org/uploads/1/3/1/0/131070355/dmca.html
    • http://xtwdn6.brdge.org/uploads/1/3/1/0/131070355/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sipemuxi.files.wordpress.com/2020/06/10962002475.pdf
    • https://zurogisola.files.wordpress.com/2020/06/tozugaxeb.pdf
    • https://wubatelevad.files.wordpress.com/2020/06/gutujupinuju.pdf
    • https://polunut843765986.files.wordpress.com/2020/06/30157482272.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0b.bin
ce45e90b06130dcb072b2c49cbafb6c56c2f8e6d33819a448a8a30467f5f1e71
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 10972 bytes