Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afc881548643e86…

MALICIOUS

PDF

41.2 KB Created: 2020-04-06 10:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a5c5ee6b08a10b49f12325c81ecf1dff SHA-1: 183cdf894f19a493b9fe2e045b3f34048aec2b23 SHA-256: 3afc881548643e865ea7972e2713230a967accbe4861b5af81543cf59c0b96d4
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to PDF files, indicating a link farm or SEO abuse tactic. The document body, though partially corrupted, contains text related to contracts and legal notices, suggesting a lure to disguise malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs further supports a malicious classification. The primary goal appears to be directing users to potentially malicious external content.

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://hazmatpackingandsupplies.com/uploads/1/3/0/2/130273982/130273982.html#contrato+por+obra+y+servicio+tiempo+preaviso
    • http://clareclarkeswimschool.com/uploads/1/3/0/7/130740340/tugab_maruvosuvatas_xokanupofis_vepireku.pdf
    • http://hopkinshealthcarerx.com/uploads/1/3/0/5/130590203/88d9154dda5.pdf
    • http://c-clefclassics.com/uploads/1/3/1/4/131453530/wuzunumejobadud-vomimonume-kutuxiru.pdf
    • http://tuslawmustangsfootball.com/uploads/1/3/0/7/130740568/6ad66920d4474f6.pdf
    • http://dlconstructionllc.org/uploads/1/3/0/5/130544954/9106432.pdf
    • http://affiliateprepaid.com/uploads/1/3/0/4/130475981/8955324.pdf
    • http://simplysupportive.net/uploads/1/3/1/0/131070820/xasotuzoxa.pdf
    • http://vintage-guitar.net/uploads/1/3/1/4/131407424/6612137.pdf
    • http://ttmquantum2016.com/uploads/1/3/0/6/130605519/tojukigomurilo_mazewus_nalimabex.pdf
    • http://cartwrightgains.com/uploads/1/3/0/6/130621446/2089306.pdf
    • http://simplyessentiallife.com/uploads/1/3/0/6/130640214/2320767.pdf
    • http://angeloakfitness.com/uploads/1/3/0/7/130776401/fomurawidazew.pdf
    • http://hairbymeducocoa.com/uploads/1/3/0/6/130620979/kamig_jututukipejo_kubosutabukew.pdf
    • http://leandeployment.com/uploads/1/3/0/3/130379110/pofuwulibidowuv.pdf
    • http://sacredceremony.net/uploads/1/3/0/5/130551155/8570603.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_off00007642.bin
5ae973ff5eca50d94727a1406182912f00ef6acdab41c87f49b0d1f0eed44d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7642 9188 bytes

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