Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cc07a5740e8b86…

MALICIOUS

PDF

45.1 KB Created: 2020-03-20 13:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a90e2a499669b6b60b8c765cfd41e0ee SHA-1: f3fa227c0541083b3ea8abd204306f49b266235d SHA-256: b0cc07a5740e8b860bd3db8474cfefb7aa4da6ce593952d1f98d44999d2f7c38
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body text mentions a 'F1 error code on whirlpool dryer', likely a lure to entice users to click the embedded links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://pameladirnberger.com/uploads/1/3/0/6/130603866/130603866.html#f1+error+code+on+whirlpool+dryer
    • http://myzencoach.com/uploads/1/3/0/4/130488970/gomogu-pelunijew-nedozenamef-kavujavufitu.pdf
    • http://www.piscinasnaturalescolombia.com/uploads/1/3/0/6/130620560/moxijasog-zusot.pdf
    • http://tradingblockpro.net/uploads/1/3/0/7/130738614/todojeji_pemolurevod.pdf
    • http://oufootball.us/uploads/1/3/0/6/130605083/gogipikesu-pumubabimom-buxav.pdf
    • http://www.richarddaviescelebrant.com/uploads/1/3/0/8/130874146/bapox-bepuju.pdf
    • http://cherishedcreation.net/uploads/1/3/0/3/130379305/4ff9dfda12c72.pdf
    • http://daytonheritagemuseum.org/uploads/1/3/0/5/130550752/sidelurusizu.pdf
    • http://bgainfo.com/uploads/1/3/0/7/130739669/3855344.pdf
    • http://nhrealestate.org/uploads/1/3/0/5/130545753/bb72a5e8d11.pdf
    • http://skylinesjewellery.com/uploads/1/3/0/6/130621342/0b28fc406.pdf
    • http://hairtoolla.org/uploads/1/3/0/4/130489230/6931991.pdf
    • http://ltcampervanconversions.co.uk/uploads/1/3/0/5/130541221/0c2629cfd.pdf
    • http://vibes.my-bijoux.nl/uploads/1/3/0/7/130775513/91c26af5.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_off000085f6.bin
7f5ae626ee93a6083f918bda9ef3aeb9fce1fce37d06e2e3cef90db313469b20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85F6 8636 bytes

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