Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5bf23e57074b2e…

MALICIOUS

PDF

36.2 KB Created: 2020-06-13 06:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f4e520d861f8e1ac966d3b710382d73 SHA-1: 9b2981f454b37d459b697e3f539c0aba5f2f1cf7 SHA-256: 7c5bf23e57074b2e5d007b58f28c8978394252e919589e5148c0e5b3b0980db2
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external PDF files, identified by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains strings that appear to be related to these URLs. The primary purpose seems to be directing users to a network of linked documents, likely for SEO poisoning or to distribute further malicious 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://cpanel.hmcl.hk/uploads/1/3/0/2/130288802/130288802.html#pes+2013+s%25C4%25B1k%25C4%25B1%25C5%259Ft%25C4%25B1r%25C4%25B1lm%25C4%25B1%25C5%259F+indir
    • http://bakerlawga.com/uploads/1/3/0/7/130776211/sutuba.pdf
    • http://homan.co.za/uploads/1/3/0/8/130813654/6590983.pdf
    • http://craniosacralnashville.com/uploads/1/3/1/8/131871734/dimijexaleridobug.pdf
    • http://impact-active.com/uploads/1/3/1/4/131406295/2248554.pdf
    • http://eastmeetswestau.com/uploads/1/3/1/3/131398024/piriledowilunoxubase.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tamifeduju.files.wordpress.com/2020/06/13492730670.pdf
    • https://piriworaki.files.wordpress.com/2020/06/kurajasaxowelevafob.pdf
    • https://nebosevali.files.wordpress.com/2020/06/89642395404.pdf
    • https://xaluwab.files.wordpress.com/2020/06/31401792840.pdf
    • https://puwerubeguro.files.wordpress.com/2020/06/40790249172.pdf
    • https://derexomej.files.wordpress.com/2020/06/5900161044.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_off000059dc.bin
78a1846f32f3f940bb237852fbf9e25914fbf5f3b8a2bb98b75d5eadfeafe6b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59DC 13976 bytes

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