Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1b0fb26ec87634…

MALICIOUS

PDF

33.8 KB Created: 2020-06-12 01:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 3c023ae51fe31a49e648a2fbb3a1124b SHA-1: 659a5a7fef13bc4c831dbfb7ac8c221d09719222 SHA-256: 7d1b0fb26ec8763477c74e7a5644b8be87ffc5586c9c3584a5008488487eeea8
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains that appear to be part of a link farm, suggesting an attempt at SEO manipulation or redirecting users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports a malicious intent. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or content-luring campaign.

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://makeupbycamille.com/uploads/1/3/0/5/130544702/130544702.html#expanded+form+worksheets+4th+grade PDF link annotation
    • http://mx.stampgeneral.com/uploads/1/3/0/6/130604771/8692020.pdfIn PDF document text
    • http://zodiaccomics.com/uploads/1/3/0/6/130604111/5508242.pdfIn PDF document text
    • http://steelstringsmusic.com/uploads/1/3/0/3/130323998/pisurer_somagumupox.pdfIn PDF document text
    • http://gweltonandassociates.com/uploads/1/3/0/2/130270963/8626510.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zunuxav.files.wordpress.com/2020/06/56196777286.pdfIn PDF document text
    • https://gusugiji.files.wordpress.com/2020/06/54893688661.pdfIn PDF document text
    • https://dokubonese.files.wordpress.com/2020/06/45922182798.pdfIn PDF document text
    • https://simesodut.files.wordpress.com/2020/06/gebizofefi.pdfIn PDF document text
    • https://xibupipoj.files.wordpress.com/2020/06/39834224467.pdfIn PDF document text
    • https://dexugosaduj.files.wordpress.com/2020/06/furawadux.pdfIn PDF document text
    • https://nimodinuti111298458.files.wordpress.com/2020/06/vewitojuxinaguva.pdfIn PDF document text
    • https://lebavop.files.wordpress.com/2020/06/ginolojamixavev.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A88 9744 bytes
SHA-256: 031b27655d18ab320fa7494155c0f9a203b297b0bd57da28531df0f80a3fb621