Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5dc8992696d9ad8…

MALICIOUS

PDF

97.0 KB Created: 2020-03-20 08:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2361f44a4f485471866511b82d071c91 SHA-1: 94fe2158e06ccc963f5da43003c8514498dfc942 SHA-256: e5dc8992696d9ad818daceb48d3fd2f827991bebf19d6ad0dc54176a0a964b81
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which are numerically or generically named PDFs, suggesting a link farm or SEO abuse tactic. The document body mentions 'Skyrim se ps4 hair mods bethesda', likely a lure to attract clicks to the embedded URLs. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links points to a delivery mechanism for potentially malicious content hosted on these external sites.

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://oxfordfitfun.com/uploads/1/3/0/2/130291449/130291449.html#skyrim+se+ps4+hair+mods+bethesda
    • http://pizzabellarestaurant.net/uploads/1/3/0/3/130323268/wifobeponapozagol.pdf
    • http://johnridleyformayor.net/uploads/1/3/0/4/130488241/detoviwu-jalomenobomokuf-dasimedesapi-gujad.pdf
    • http://mta-sts.mx.mandorlabooks.com/uploads/1/3/0/5/130540097/4166688.pdf
    • http://vck.global/uploads/1/3/0/2/130272381/lobiw-darasuxuno-kadereronifoxu-vujibuzesesiz.pdf
    • http://columbusstars.net/uploads/1/3/1/0/131070521/nimomefisokuriku.pdf
    • http://damianob.com/uploads/1/3/0/3/130323148/newuwafiv.pdf
    • http://bbt.network/uploads/1/3/0/2/130289658/wemabedopo_tuwapalimu_dugas_fobenapurepu.pdf
    • http://texaslivingsoils.com/uploads/1/3/0/4/130483474/vozesepow.pdf
    • http://wholenessretreat.org/uploads/1/3/0/5/130589449/wisaxarinosilefaz.pdf
    • http://integrityats.net/uploads/1/3/0/4/130478057/woxavikovaxekef-deworexatij-pirak.pdf
    • http://charterbusservice.com/uploads/1/3/0/3/130379818/31ebfd41ee.pdf
    • http://yamayogacollective.com/uploads/1/3/0/7/130775527/5762962.pdf
    • http://www.hoozenconsulting.com/uploads/1/3/0/6/130639621/piremezegiju-taxozi.pdf
    • http://growerconsultants.com/uploads/1/3/0/5/130542872/fenojixazez.pdf
    • http://www.dreamyfaces.com/uploads/1/3/0/6/130639030/710054.pdf
    • http://oscarchavezphotography.net/uploads/1/3/0/8/130814382/3797408.pdf
    • http://thegrampo.com/uploads/1/3/0/5/130588922/memela.pdf
    • http://pipsprettypaws.me/uploads/1/3/0/7/130738739/votikafumimerumir.pdf
    • http://www.royalofficefurniture.net/uploads/1/3/0/3/130313262/3ca2f3d28.pdf
    • http://30wallst.com/uploads/1/3/0/2/130288458/36071b2148b5a5.pdf
    • http://www.geras.sk/uploads/1/3/0/2/130274109/buwatasemodur.pdf
    • http://panicroomrichmond.com/uploads/1/3/0/3/130312916/dogefu.pdf
    • http://www.citystudent.se/uploads/1/3/0/4/130483402/nabixiwut.pdf
    • http://www.jessicadowens.com/uploads/1/3/0/2/130289585/c279191.pdf
    • http://mail.ebenezerbaptistchurchlanc.com/uploads/1/3/1/0/131071066/ziwopekazutuxo_zotasiwujavif_balizi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014034.bin
06a5f9bcb01d70ea109a3235106c6eb399911183bdd985b03436dc2f0ecf2cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14034 8532 bytes
font_01_sfnt_off0001612c.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1612C 16036 bytes

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