Malicious PDF — malware analysis report

Static analysis result for SHA-256 de71e5318765efbb…

MALICIOUS

PDF

45.5 KB Created: 2020-03-25 12:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 98d1af16e1da18768626c8890f01ce8e SHA-1: 1b53e0f27850452422bbb369d332de6dcf85053b SHA-256: de71e5318765efbb0f9eb048a0c4d1536b7325f27543a62be90206665c8e32ee
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on unrelated domains. This pattern is indicative of a link farm or SEO spamming technique, often used to distribute malicious content or manipulate search engine rankings. The ML classifier strongly supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://bottlestobooksprimaryschool.com/uploads/1/3/0/5/130551362/130551362.html#que+es+calendario+a+y+b+en+los+colegios
    • http://www.beginmetbeleggen.nl/uploads/1/3/0/4/130490687/fabel.pdf
    • http://radconbraidwood.com/uploads/1/3/0/4/130483565/selagebubavu.pdf
    • http://chalkboardquilts.com/uploads/1/3/0/3/130313411/7142499.pdf
    • http://liliyasalon.com/uploads/1/3/0/5/130589276/nikidapexo.pdf
    • http://www.giovannaluxuryvirginhair.net/uploads/1/3/0/6/130605028/kegiliv.pdf
    • http://jllcapitalmarkets5nplus.com/uploads/1/3/0/2/130273748/dipijovafukozase.pdf
    • http://simplerprogrammer.com/uploads/1/3/0/6/130620910/jorixemewira.pdf
    • http://fbgnaturalbabyshop.com/uploads/1/3/0/4/130483794/kubowig.pdf
    • http://autodiscover.cfsbhm.org/uploads/1/3/0/6/130621351/sojeru-wefax-nizitijugumoso-peratoritoj.pdf
    • http://artemisassessment.com/uploads/1/3/0/5/130539637/f640e.pdf
    • http://jamescancer.info/uploads/1/3/0/3/130323285/4619877.pdf
    • http://mail.canterbury-taekwondo.com/uploads/1/3/0/6/130620382/b5eb7f379cd0e7c.pdf
    • http://molim.net/uploads/1/3/0/6/130621610/596740.pdf
    • http://mjrlashes.com/uploads/1/3/0/6/130620852/bcbea54.pdf
    • http://soundanddoctrine.com/uploads/1/3/0/6/130603721/8376042.pdf
    • http://www.aggormorclienti.com/uploads/1/3/0/7/130776257/wujagu.pdf
    • http://aiqcboston.org/uploads/1/3/0/5/130588151/wawidenutevo.pdf
    • http://beeldschermverhuur.eu/uploads/1/3/0/4/130489371/levofosaripik-dazabivexad.pdf
    • http://mta-sts.compellingministries.com/uploads/1/3/0/5/130539419/4803059.pdf
    • http://saasenablement.com/uploads/1/3/0/4/130435602/2915942.pdf
    • http://7765.heathermcclarriephotography.com/uploads/1/3/0/4/130476786/titeze-davoximewul.pdf
    • http://selfsufficientteen.com/uploads/1/3/0/5/130588858/4275018.pdf
    • http://villageyouth.net/uploads/1/3/0/7/130776757/d55d7d662d.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_off000077c4.bin
d79a5ad05c2215b231bb14a3c64d95bf4c7b74626f77b823ef9cd029a0318c06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C4 9272 bytes
font_01_sfnt_off000098c5.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98C5 4144 bytes

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