Malicious PDF — malware analysis report

Static analysis result for SHA-256 197900f67c44ba8b…

MALICIOUS

PDF

46.7 KB Created: 2020-05-08 20:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 61dc539cb77f84ff00a985096b7d1203 SHA-1: f7a45981c3b233ead66afe20f9fed6072f0acafd SHA-256: 197900f67c44ba8b5a6af89522cfe2fbbb6d2715713ea7d24f5627caf5600142
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the extracted URL list, suggesting a coordinated effort to direct users to potentially malicious websites. No scripts were extracted, but the sheer volume of external links points to a link-farming or redirection attack.

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://spectrumherniaclinic.com/uploads/1/3/0/2/130291539/130291539.html#bridge+to+terabithia+hd+movie
    • http://findmyguardian.com/uploads/1/3/1/3/131379980/08d906a4c425.pdf
    • http://zeusbconstruction.com/uploads/1/3/0/6/130604255/9628222.pdf
    • http://adentaspain.es/uploads/1/3/0/4/130483295/3273130.pdf
    • http://thenehefoundation.com/uploads/1/3/0/2/130273625/5721505.pdf
    • http://tntfuntimes.net/uploads/1/3/0/6/130639508/7554135.pdf
    • http://certi5edvictories.com/uploads/1/3/1/0/131071312/1383729b4f18911.pdf
    • http://spokanebirddog.org/uploads/1/3/1/3/131384113/papotapumukefebo.pdf
    • http://tiffanytucker.us/uploads/1/3/1/3/131398286/rujasejibaj-zidijurumenubek-dosonejol.pdf
    • http://thelucioconnectionjewelry.com/uploads/1/3/0/8/130814292/1085426.pdf
    • http://womansring.org/uploads/1/3/0/3/130379466/timovas_vevofezewudes_vajusa_gegasopapos.pdf
    • http://actionhomerepair.com/uploads/1/3/1/4/131437871/5581080.pdf
    • http://majesticpleasantprairie.com/uploads/1/3/0/6/130621552/dojibemejubaposiju.pdf
    • http://comicsandcognac.com/uploads/1/3/0/9/130969315/dekamisipuzavo-pinov-wobatojataja-fimipin.pdf
    • http://ademie.com/uploads/1/3/0/6/130621421/6219ece5.pdf
    • http://drivertraininghq.com/uploads/1/3/0/7/130738903/rekababujeturo.pdf
    • http://oneeyebig.com/uploads/1/3/1/4/131408131/xaxureribitazafulo.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000063d7.bin
36be061e21a36f63b74a14db6313aba8a3a7a90695d734cba47774f39b2dbece		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x63D7 14244 bytes
font_01_sfnt_off00008b03.bin
2f51b0128c5b528c6a4324150045b27ffd4d5aab5d33c80a410b4d0826d7ed7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B03 10832 bytes

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