Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fac16d66973e76…

MALICIOUS

PDF

72.3 KB Created: 2020-03-30 06:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 151d86bb4bec9ed01d49985a9cbd689a SHA-1: 68e08bedb93aee9969861b122eff2e16fc4dcf94 SHA-256: a9fac16d66973e76d93cbf63da738749836a3e4a5ea2c7e340b73c12536515df
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. The primary attack pattern observed is the PDF_SEO_LINK_FARM heuristic, which identifies a mass external PDF link farm. The embedded URLs are likely part of this link farm, aiming to redirect users to potentially harmful content.

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://adsl-63-204-18-59.benefitplans.org/uploads/1/3/0/6/130604551/130604551.html#porcentaje+de+poblacion+mundial+que+vive+en+islas+segun+national+geographic
    • http://mmwallandcompany.com/uploads/1/3/0/3/130379397/palijizinaz_rikemugu_kosek.pdf
    • http://savewaycenter.com/uploads/1/3/0/3/130323293/35def2c9beac.pdf
    • http://www.familiamdei.com/uploads/1/3/1/4/131453618/e918757f045.pdf
    • http://easternfclass.ca/uploads/1/3/0/2/130272937/13156.pdf
    • http://caribmb.com/uploads/1/3/0/7/130776886/9159d05b653.pdf
    • http://chocolaticity.net/uploads/1/3/0/9/130969957/joberimabusujexakat.pdf
    • http://aromaangels.org/uploads/1/3/0/2/130289235/jizisa-nokovofeb.pdf
    • http://chpisland.com/uploads/1/3/0/6/130605306/xofeputivebaxupepozo.pdf
    • http://kasakadanca.com/uploads/1/3/0/5/130589415/vowomufoliwej.pdf
    • http://jhp.photography/uploads/1/3/0/3/130379162/lifulinezakisolip.pdf
    • http://andrianaediting.ca/uploads/1/3/0/9/130969839/sumusaxisa.pdf
    • http://misadvogada.com/uploads/1/3/1/1/131163854/pesalizodopepume.pdf
    • http://www.silverbirchhomestead.com/uploads/1/3/0/7/130775411/e72e5fe58c6.pdf
    • http://usabeachtour.org/uploads/1/3/0/9/130969149/mabam.pdf
    • http://garagerepairservicemiami.com/uploads/1/3/0/2/130272573/f26e1076.pdf
    • http://pikesurfschool.com/uploads/1/3/0/5/130540402/movomawevanin-kozogujesotag-tadupawubajiv.pdf
    • http://rellgotembeats.com/uploads/1/3/1/3/131379636/137ad02b296.pdf
    • http://naturesobservatory.com/uploads/1/3/0/6/130640162/7627001.pdf
    • http://clichecourse.com/uploads/1/3/0/6/130604458/9bced36299eff.pdf
    • http://floresbakehaus.com/uploads/1/3/1/3/131380850/3048b1.pdf
    • http://dougkeeler.com/uploads/1/3/0/6/130639236/4dfb890.pdf
    • http://downundermigration.com/uploads/1/3/0/4/130435902/rilikeb_maler.pdf
    • http://misionescuatrocienegas.com/uploads/1/3/0/4/130490928/f2788e79fcaa.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_off0000cbca.bin
2ac156bb2eff09f514263e304844faa3ee90efd76b53e5596a03a11e7c5e6473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 10672 bytes
font_01_sfnt_off0000f0fa.bin
480437884ac0b6d9fcc812d03c56ed28f568666de2b30b44bd42ac9599fc2464		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 2680 bytes
font_02_sfnt_off0000fa84.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 16036 bytes

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