Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac65bdff35863e4e…

MALICIOUS

PDF

41.1 KB Created: 2020-03-28 07:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d61994e0a224e4d72257101c9c1c8f7f SHA-1: 84ac2d1eb0ce3b00058369fd3ff98c11190a7c27 SHA-256: ac65bdff35863e4e35b70dd2fec609266696c7fe9e438861d83c8f6d90eabaa9
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to drive traffic to potentially harmful destinations.

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://citizensarmory.net/uploads/1/3/1/4/131437363/131437363.html#yakima+king+joe+pro+2+fit+guide
    • http://carbidetix.com/uploads/1/3/0/8/130874468/somilofimipik.pdf
    • http://oyekanlaws.com/uploads/1/3/0/5/130589228/wurokiguvimo-timewudiroxivan-wamamosafidir.pdf
    • http://pisec.org/uploads/1/3/0/4/130483394/31dc2.pdf
    • http://snitchbook.net/uploads/1/3/0/8/130814295/kaxenur_kudavaf_fisoziwaw_bulitadofevu.pdf
    • http://www.gemmaandjames.co.uk/uploads/1/3/0/2/130272232/firep_vananeluto_nesinaberin_zazuwaxaloba.pdf
    • http://www.blackwillowtattoo.net/uploads/1/3/0/5/130589085/sufujera_vusipazado_gapezixagap_bisovofezif.pdf
    • http://hki-og.com/uploads/1/3/0/4/130476661/semituwuwimafuvoset.pdf
    • http://mkcinvestmentsllc.com/uploads/1/3/0/5/130539714/kesesurokut.pdf
    • http://www.briangabel.com/uploads/1/3/0/8/130814246/9593772.pdf
    • http://www.footballtech.co.uk/uploads/1/3/0/2/130289722/5076366.pdf
    • http://miagdavila.com/uploads/1/3/0/5/130588213/fukozexolajovad.pdf
    • http://www.kathrynknecht.com/uploads/1/3/0/7/130739490/5999969.pdf
    • http://magnumopusglobal.com/uploads/1/3/0/4/130489523/70e6d3.pdf
    • http://www.lindcouleelabs.com/uploads/1/3/0/5/130540366/pulexegasaz-jebegavotefit.pdf
    • http://cjdavidsonmusic.com/uploads/1/3/0/6/130639676/tekabagatudi.pdf
    • http://darianpayma.com/uploads/1/3/0/7/130739928/jubofo.pdf
    • http://joshhutson.net/uploads/1/3/0/3/130323462/vopumir-sawirow-fatixemodujina-wagimukenepi.pdf
    • http://castofcomic.com/uploads/1/3/0/5/130539599/5676137.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_off00007044.bin
8f34790ca372a244dd359e5778934b35ca0a8d719aaa7544adcf30f4785af16e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7044 1632 bytes
font_01_sfnt_off00007811.bin
d6ed0fec410a793efcf4c976ef4a41627071500c4b22e09c94d87ac79505b52f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7811 7884 bytes