Malicious PDF — malware analysis report

Static analysis result for SHA-256 812f9b8b14e601b3…

MALICIOUS

PDF

47.7 KB Created: 2020-03-21 14:15:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 1a64af14d0dfeffd2323d2e8954d1001 SHA-1: e1dc75d87ed5da0cc786383643660994a051f956 SHA-256: 812f9b8b14e601b3f20999c385c89665aaf3d3d1a7cb6b16ea75ef2bb454237b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect the user.

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://mattgangloff.com/uploads/1/3/0/6/130605078/130605078.html#que+es+rese%C3%B1a+literaria+wikipedia PDF link annotation
    • http://stillafraidofthedark.club/uploads/1/3/0/4/130478203/ruvomezejelaritolu.pdfIn PDF document text
    • http://pervading.net/uploads/1/3/0/6/130604632/gekipidewiso.pdfIn PDF document text
    • http://mta-sts.mail.cybercats5436.com/uploads/1/3/0/8/130814176/2139095.pdfIn PDF document text
    • http://mulondolostlovespells.com/uploads/1/3/0/6/130620473/bobegizuniso.pdfIn PDF document text
    • http://www.bpmsreunion.com/uploads/1/3/0/6/130639099/vanatoxitusenutogor.pdfIn PDF document text
    • http://mail.caterpillarcorner.org/uploads/1/3/0/7/130775892/5073334.pdfIn PDF document text
    • http://windsorwesley.com/uploads/1/3/0/5/130538996/mujekopixatozutiz.pdfIn PDF document text
    • http://mta-sts.mail.kunstnebel.ch/uploads/1/3/0/6/130604086/jikuwikukawegesi.pdfIn PDF document text
    • http://newtestamentchristianschool.com/uploads/1/3/0/5/130545666/234f6de.pdfIn PDF document text
    • http://mywellnesskitchen.com/uploads/1/3/0/5/130588605/sopaxofuga_wotodi.pdfIn PDF document text
    • http://www.jeremykandre.info/uploads/1/3/0/5/130589297/6464391.pdfIn PDF document text
    • http://rebeccasrusticrentals.com/uploads/1/3/0/7/130775084/285015.pdfIn PDF document text
    • http://good.tax/uploads/1/3/0/7/130775542/sijonuratorux_buwun_budavimema_wagokuwapidedo.pdfIn PDF document text
    • http://alsrace.nl/uploads/1/3/0/4/130476248/getizasativawibena.pdfIn PDF document text
    • http://www.umhistoroicalsocietymn.org/uploads/1/3/0/4/130489650/morewaz.pdfIn PDF document text
    • http://preparedbirth.com/uploads/1/3/0/6/130603926/damosexapa.pdfIn PDF document text
    • http://diabetesrelatedretinopathy.org/uploads/1/3/0/2/130289236/8268710.pdfIn PDF document text
    • http://chrisministries.com/uploads/1/3/0/7/130776177/kupifujo.pdfIn PDF document text
    • http://ilaugh.club/uploads/1/3/0/4/130483895/1941184.pdfIn PDF document text
    • http://familydentistryfresno.com/uploads/1/3/0/3/130323997/70122aa1ad1b18c.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E40 9236 bytes
SHA-256: f36da86da1a043f54360f19cdab397266898faf5c6bc27f27321368352bc74ba

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