Malicious PDF — malware analysis report

Static analysis result for SHA-256 8356611c51fe6e1d…

MALICIOUS

PDF

31.4 KB Created: 2020-04-14 12:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cc10765676fd24c553dbef3ceb751364 SHA-1: 0eaf246c4cb389d2af7a6d3f91b59d557596d2c2 SHA-256: 8356611c51fe6e1d955465f0aa98880e4c2e5d24477fed4d9691a5377fcbca04
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or content distribution scheme, likely intended to manipulate search engine results or distribute malware.

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://highandproud.com/uploads/1/3/0/6/130621407/130621407.html#infuriate+crossword+answer
    • http://horeda.com/uploads/1/3/1/4/131453174/75b767dc13b.pdf
    • http://ensemble-paris-nanterre.com/uploads/1/3/0/3/130379377/3372718.pdf
    • http://wrighthvac07.com/uploads/1/3/1/0/131070197/botijagotazopuluru.pdf
    • http://purrsonalspacecatlounge.com/uploads/1/3/1/3/131381612/wowij_gudidire_zelokulekuwuvix.pdf
    • http://melonsbetterdriving.com/uploads/1/3/0/7/130739001/b68c714ee5.pdf
    • http://tanjarinewellness.com/uploads/1/3/1/3/131383363/fibelipotegutolo.pdf
    • http://mattinablue.com/uploads/1/3/0/7/130739175/6041061.pdf
    • http://vyev.com/uploads/1/3/1/3/131383921/0074209bb7ee.pdf
    • http://avesselofhonor.com/uploads/1/3/0/4/130436094/libudaze.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_off000053d7.bin
be617ea83bad66e66ec572e162103ea262345d50c588a690805d709d2c32e826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53D7 7712 bytes

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