Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6af3fcc83403a3…

MALICIOUS

PDF

37.0 KB Created: 2020-04-02 02:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 19db33372a8284f48e5f4042a483247d SHA-1: e75007678c0138257f20415d1b2b0b3465d19625 SHA-256: 4e6af3fcc83403a3378f7fe4fa1d66f8cdb30afeea3c67c4b074dae40ac42ea1
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to a science book and references the wkhtmltopdf tool, suggesting a lure to disguise the malicious nature of the links. The ML_NYX_PDF_MALICIOUS classifier strongly indicates malicious intent. The primary attack pattern involves directing users to a link farm, likely for SEO manipulation or to serve malicious content.

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://growmygardens.com/uploads/1/3/1/4/131406613/131406613.html#libro+de+ciencias+naturales+3+grado+2019+a+2020
    • http://lashestech.net/uploads/1/3/0/6/130603955/kidomamufiwujije.pdf
    • http://thehollidayagency.com/uploads/1/3/0/9/130970012/8426676.pdf
    • http://heathersfabulousfinds.com/uploads/1/3/0/6/130621744/sukimisafi_jadumifilemas_renaluwumara.pdf
    • http://mobilemechanicstockport.com/uploads/1/3/1/0/131070149/54124.pdf
    • http://optimalimpactsolutions.com/uploads/1/3/0/2/130289792/mesapilo.pdf
    • http://rootedwithyou.com/uploads/1/3/0/5/130551475/sativiw_fapunevuremi_vorinuxogi_tepigisofiwufob.pdf
    • http://ssh2019.info/uploads/1/3/0/4/130489228/nevexumubedor_fusiwezobuzowu.pdf
    • http://ivduck.org/uploads/1/3/0/7/130739087/xabezixopozo_voguk.pdf
    • http://fenlandtransportservices.com/uploads/1/3/0/7/130775154/fekilijewiladegu.pdf
    • http://transporteejecutivoyturistico.com/uploads/1/3/0/4/130476024/d6120eb.pdf
    • http://lizabethblackwellonline.com/uploads/1/3/0/3/130313199/b26cf142f.pdf
    • http://idratherwearpajamas.com/uploads/1/3/0/6/130621083/3358700.pdf
    • http://perreofit.com/uploads/1/3/0/7/130740206/bosojegajatugajelo.pdf
    • http://pemcrew.blog/uploads/1/3/0/3/130313178/wevitowuwi.pdf
    • http://believezevenbergen.nl/uploads/1/3/1/4/131407110/gosaxizes-novalig-gavabis.pdf
    • http://ieatdinosaurs.com/uploads/1/3/0/2/130270980/bibok_xigaweju_kumuzolas_losizavaluwoti.pdf
    • http://kawsinfo.com/uploads/1/3/1/4/131454536/fupukojizaribu-pudisukezekina.pdf
    • http://gaydenassessoriacnh.net/uploads/1/3/0/6/130639653/vafoxapejo-mifutalif-xojasupowerisu.pdf
    • http://blackmarigold.com/uploads/1/3/0/6/130620505/wufemexor.pdf
    • http://oblivionartbar.com/uploads/1/3/0/8/130814120/rawupak-ralamulatibi-diboriwudobipib-bikep.pdf
    • http://franco12.com/uploads/1/3/1/3/131380087/pewajezafoduzo.pdf
    • http://viperfishmedia.com/uploads/1/3/0/3/130379142/wazokefofabepas.pdf
    • http://utopianremodel.com/uploads/1/3/0/7/130775589/tevaxasi-napevubab-jogetana-vetoxuge.pdf
    • http://simplybiblestories.net/uploads/1/3/1/0/131070888/625170.pdf
    • http://viperfishmedia.c
    • 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_off00006665.bin
555c6f8a6faa3872ae29b67ceb511e69c73889a7f2ce722ddae9184f05da05dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6665 8056 bytes

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