Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e699fd67b1106d2…

MALICIOUS

PDF

42.8 KB Created: 2020-03-10 12:19:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d991e4cafeea818914d2e3df9f647c1b SHA-1: 00f18775aa0a2b8522160347018ba8af3304943c SHA-256: 9e699fd67b1106d28f97ba2a50a7ae6a21bbff2461aeac93a0d3893a48976a19
94 Risk Score

Malware Insights

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

The PDF file contains a large number of 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 part of this link farm. The primary attack pattern appears to be a link farm designed to manipulate search engine results or to distribute further malicious content via the numerous linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://rapid-offroad.com/uploads/1/3/0/6/130605420/130605420.html#abkhaz+language+lessons
    • http://nelsonendeavorsllc.com/uploads/1/3/0/7/130738578/puwufumigatur-lipavubetil-wujowoliwotokux-sazotudunujaxo.pdf
    • http://strongrootsfoundationmn.org/uploads/1/3/0/6/130621730/5522166.pdf
    • http://newenglandmarineelectric.com/uploads/1/3/0/3/130313411/638211.pdf
    • http://www.memphis-made.com/uploads/1/3/0/6/130620274/rafebavodifumoperuj.pdf
    • http://activopulse.com/uploads/1/3/0/5/130545882/logeg.pdf
    • http://sophietang.com/uploads/1/3/0/7/130740572/soremupexotemi.pdf
    • http://aimonpurpose.com/uploads/1/3/0/6/130620263/2243033.pdf
    • http://e-proger.site/uploads/1/3/0/5/130538946/xekarep-gitomar-ralowuvunul-piwom.pdf
    • http://bayoflights.com/uploads/1/3/0/4/130491852/64dfb4d.pdf
    • http://newwws.club/uploads/1/3/0/6/130639115/ramomile.pdf
    • http://www.tulla.ie/uploads/1/3/0/3/130323106/kusamubiwu.pdf
    • http://johnandsallywinslow.com/uploads/1/3/0/3/130379231/8683160.pdf
    • http://caravanadelamor.org/uploads/1/3/0/5/130551882/5229718.pdf
    • http://chiarraarpaia.com/uploads/1/3/0/5/130543190/06dbeca.pdf
    • http://www.moramontsolutions.com/uploads/1/3/0/6/130603958/towomifigapamiz.pdf
    • http://natibox.com/uploads/1/3/0/2/130288603/kokuw.pdf
    • http://casamadalenadestin.com/uploads/1/3/0/6/130620268/807652.pdf
    • http://marcantoine.studio/uploads/1/3/0/5/130539419/4821899.pdf
    • http://bi4uun.com/uploads/1/3/0/7/130740077/e98ef.pdf
    • http://bartonroofingrepairservice.com/uploads/1/3/0/5/130543764/tutixumenevasala.pdf
    • http://ntagent.com/uploads/1/3/0/6/130622063/jevixa-lawegazalefevu.pdf
    • http://chambers-maids-brecon.com/uploads/1/3/0/5/130590393/8074117.pdf
    • http://minimalnaprawda.net/uploads/1/3/0/6/130605338/4681565.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_off0000805d.bin
7f86ab7fdf065e291d46f4378a60a3b029cc19c111ef5d17e5734af7059c1b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x805D 7508 bytes

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