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)
MD5: 1a64af14d0dfeffd2323d2e8954d1001 SHA-1: e1dc75d87ed5da0cc786383643660994a051f956 SHA-256: 812f9b8b14e601b3f20999c385c89665aaf3d3d1a7cb6b16ea75ef2bb454237b
94 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious. It contains a large number of external links, many of which point to domains that appear to be part of a link farm. The primary purpose seems to be SEO manipulation or redirecting users to potentially harmful content through these numerous links. No scripts were extracted, and the document body was heavily corrupted.

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
    • http://stillafraidofthedark.club/uploads/1/3/0/4/130478203/ruvomezejelaritolu.pdf
    • http://pervading.net/uploads/1/3/0/6/130604632/gekipidewiso.pdf
    • http://mta-sts.mail.cybercats5436.com/uploads/1/3/0/8/130814176/2139095.pdf
    • http://mulondolostlovespells.com/uploads/1/3/0/6/130620473/bobegizuniso.pdf
    • http://www.bpmsreunion.com/uploads/1/3/0/6/130639099/vanatoxitusenutogor.pdf
    • http://mail.caterpillarcorner.org/uploads/1/3/0/7/130775892/5073334.pdf
    • http://windsorwesley.com/uploads/1/3/0/5/130538996/mujekopixatozutiz.pdf
    • http://mta-sts.mail.kunstnebel.ch/uploads/1/3/0/6/130604086/jikuwikukawegesi.pdf
    • http://newtestamentchristianschool.com/uploads/1/3/0/5/130545666/234f6de.pdf
    • http://mywellnesskitchen.com/uploads/1/3/0/5/130588605/sopaxofuga_wotodi.pdf
    • http://www.jeremykandre.info/uploads/1/3/0/5/130589297/6464391.pdf
    • http://rebeccasrusticrentals.com/uploads/1/3/0/7/130775084/285015.pdf
    • http://good.tax/uploads/1/3/0/7/130775542/sijonuratorux_buwun_budavimema_wagokuwapidedo.pdf
    • http://alsrace.nl/uploads/1/3/0/4/130476248/getizasativawibena.pdf
    • http://www.umhistoroicalsocietymn.org/uploads/1/3/0/4/130489650/morewaz.pdf
    • http://preparedbirth.com/uploads/1/3/0/6/130603926/damosexapa.pdf
    • http://diabetesrelatedretinopathy.org/uploads/1/3/0/2/130289236/8268710.pdf
    • http://chrisministries.com/uploads/1/3/0/7/130776177/kupifujo.pdf
    • http://ilaugh.club/uploads/1/3/0/4/130483895/1941184.pdf
    • http://familydentistryfresno.com/uploads/1/3/0/3/130323997/70122aa1ad1b18c.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_off00008e40.bin
f36da86da1a043f54360f19cdab397266898faf5c6bc27f27321368352bc74ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E40 9236 bytes

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