Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39cf61303b263e4…

MALICIOUS

PDF

34.7 KB Created: 2020-06-17 08:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79109a862bbf4a24ae9c5fcec8d9268d SHA-1: 754314d646b3c41621cf8e41fc62f42477e85e0f SHA-256: a39cf61303b263e485de6ddccd88b48eea853fa743e55b1d42eb6138db1f082b
70 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.001 PowerShell

The PDF contains embedded JavaScript and a large number of external links, indicating a likely SEO poisoning or link farm attack. The primary heuristic identified a mass of external PDF links, suggesting the document's purpose is to redirect users to a network of other PDF files hosted on compromised or attacker-controlled domains. No specific script functionality was detailed, but the overall pattern points to a content-distribution or redirection scheme.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://confidance.eu/uploads/1/3/1/6/131606331/131606331.html#2nd+grade+holiday+worksheets
    • http://webmail.losangelesworkingdogs.com/uploads/1/3/0/6/130603749/nixiwosaxidobivu.pdf
    • http://bumpkinfoodhub.com/uploads/1/3/0/9/130969053/668782d5e5ea3e0.pdf
    • http://hostmaster.premierprescotthomes.com/uploads/1/3/0/5/130551654/344d5247d5b2fa.pdf
    • http://2vv.undesirable.us/uploads/1/3/0/7/130776026/latilekuvusamogikob.pdf
    • http://tac-performance.com/uploads/1/3/2/3/132303156/3e1d40f193c3.pdf
    • http://whm.alisonrooke.com/uploads/1/3/0/7/130775009/988ea9c2.pdf
    • http://dmcneilpercussion.com/uploads/1/3/0/3/130323157/82a14.pdf
    • http://matrixcarpetbinder.com/uploads/1/3/0/6/130621307/duselekosetisab_wajewodo_gezewotapute_pugixitiw.pdf
    • http://mail.confidance.com/uploads/1/3/0/4/130488338/40cb306cc2.pdf
    • http://channelcars.co.uk/uploads/1/3/0/7/130739090/rudikusitut.pdf
    • http://rimasrl.facile.hosting/uploads/1/3/0/4/130492038/2679364.pdf
    • http://sammyjean.net/uploads/1/3/0/3/130313359/2392122.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d74.bin
237b263ea2c004065e7481cc2409c5f4cc816279657398706f4ad3a947300b9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D74 5172 bytes
font_01_sfnt_off00005f01.bin
57210d6f711c6dd913a43ca7592705c1220774058004b231898f8ae137184c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F01 9352 bytes

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