Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e1cd47f099fa8a…

MALICIOUS

PDF

62.7 KB Created: 2020-03-29 12:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dc9304ca6c035782576a26f4e91309c8 SHA-1: 356da16590c07a62d7b9c9f87ba782b3ae289a4a SHA-256: 58e1cd47f099fa8a47771764091b828fbffe385d911d4bebb41f82d19bf24c73
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for SEO link farming or to direct users to malicious content. The document body, though partially obfuscated, contains a URL that points to a page with similar content, further supporting the lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://74-123-76-197.mgwnet.com/uploads/1/3/0/4/130476538/130476538.html#caracteristicas+de+positivismo+juridico
    • http://sharingfamilymemories.org/uploads/1/3/0/8/130815351/wopuwebalubomasabutu.pdf
    • http://plantdefender.net/uploads/1/3/0/6/130621603/152260.pdf
    • http://fitness-private.com/uploads/1/3/0/5/130539155/dusowevodare-guwajubepuxuf.pdf
    • http://slautoworx.com/uploads/1/3/0/8/130814579/xupaluv.pdf
    • http://scottcookauthor.com/uploads/1/3/0/8/130813550/liduwaxetewuge.pdf
    • http://takenoforananswer.com/uploads/1/3/0/2/130289797/meledawimov.pdf
    • http://tbsbyjmeon.com/uploads/1/3/0/7/130739892/7248251.pdf
    • http://3d-makers.com/uploads/1/3/0/9/130969231/tupiz-vifik-larizerap-wakagalukuditut.pdf
    • http://nutrimoda.com/uploads/1/3/0/4/130489371/8303ef349451.pdf
    • http://northwesternbreastsurgeons.com/uploads/1/3/0/7/130775848/ec260b0c1b2ab.pdf
    • http://rbmcoaching.com/uploads/1/3/0/6/130639636/mitafunona.pdf
    • http://giving2day.com/uploads/1/3/0/5/130540874/3862733.pdf
    • http://leocomp.com/uploads/1/3/0/4/130488847/8533ebdbd.pdf
    • http://fitnfocusedonline.com/uploads/1/3/0/4/130489367/4940953.pdf
    • http://rfjobstoday.com/uploads/1/3/0/6/130620979/7eb1286e2a977.pdf
    • http://ontracbyreinke.com/uploads/1/3/0/5/130588675/c6194114a.pdf
    • http://blacklines.org/uploads/1/3/0/6/130604201/1174251.pdf
    • http://avediflooring.com/uploads/1/3/0/4/130488994/dotibigutalex.pdf
    • http://tecfrico.com/uploads/1/3/0/4/130490006/ropagubenovizu.pdf
    • http://md2xdt2.com/uploads/1/3/0/7/130776123/123577.pdf
    • http://storringtondfas.org/uploads/1/3/0/2/130274319/8689511.pdf
    • http://mugarik.com/uploads/1/3/0/4/130483443/labumijapifo.pdf
    • http://charlesheinerfiction.com/uploads/1/3/0/7/130775545/935ed0f72.pdf
    • http://odditieschicago.com/uploads/1/3/0/8/130814457/d817331.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa0f.bin
4d15fe21e545713e339c648d5b5c7d12a5283cc75a66a34b4d1183518750e9c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA0F 9400 bytes
font_01_sfnt_off0000cbc1.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 2652 bytes
font_02_sfnt_off0000d528.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 16036 bytes

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