Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff4c7ff6008353a…

MALICIOUS

PDF

38.5 KB Created: 2020-04-19 20:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 707545a65d0d877de1b34f18ced4a34c SHA-1: 5f6b232e1176f36a6927a7804f97ea711b98dda1 SHA-256: 1ff4c7ff6008353a1957fdeaa278e6a9d0c5f56c804cf223d5d6d8493f2114e9
62 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to seemingly unrelated PDF files hosted on various domains. The document body, though heavily obfuscated, contains text related to 'Letter format in ms word 2007' and the PDF itself was generated by wkhtmltopdf, suggesting a lure to trick users into downloading further malicious content or visiting phishing sites. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm, a common tactic for SEO poisoning or distributing malware.

Heuristics 3

  • 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
  • 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://jennercorp.net/uploads/1/3/0/5/130550742/130550742.html#letter+format+in+ms+word+2007
    • http://insuranceswla.com/uploads/1/3/0/6/130605339/5723367.pdf
    • http://ottawafamilyfootclinic.com/uploads/1/3/0/7/130740190/navububo.pdf
    • http://helping100people.org/uploads/1/3/0/5/130544313/zafugifuwikes.pdf
    • http://flspec.com/uploads/1/3/0/6/130621030/ranotevozuxetu.pdf
    • http://xpez.com/uploads/1/3/0/4/130436020/6060842.pdf
    • http://naturalshandmade.com/uploads/1/3/0/5/130545698/favuvosotirenupale.pdf
    • http://mathisonfamilypreschool.com/uploads/1/3/1/3/131380745/siruvebilesadum-bugekosijefa-lolulupisiguri.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_off000065f0.bin
b50f07e8e42d6a0b34165e767a91375de23e19cd591eb5945629e9b3c75509c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F0 7436 bytes
font_01_sfnt_off00008317.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8317 2616 bytes

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