Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3867432f6085df0…

MALICIOUS

PDF

89.1 KB Created: 2020-03-08 13:05:45 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1981e89aa20b3a757cbb216f399b4ecd SHA-1: 84e255ea868d019ed873d25baa6a7c7371f28255 SHA-256: e3867432f6085df0fca3a06c0ff2399e85b078bd887a8b89d062b9d5ea1e09d0
94 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm designed to manipulate search engine results. The primary purpose appears to be directing users to external, potentially malicious, content through these numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://host84.carmichaelnl.com/uploads/1/3/0/5/130551126/130551126.html#joint+distribution+of+normal+distributions
    • http://christmasinchilhowie.com/uploads/1/3/0/5/130550830/6226093.pdf
    • http://hawkesbayindoorsports.com/uploads/1/3/0/2/130288554/472999.pdf
    • http://monteschoenstatt.org/uploads/1/3/0/5/130590521/serami.pdf
    • http://trueamericanbadass.net/uploads/1/3/0/8/130874400/kaseguxupej.pdf
    • http://drgnwear.club/uploads/1/3/0/3/130323602/2595d775e6.pdf
    • http://mentalpraxis.net/uploads/1/3/0/7/130776126/bojiva.pdf
    • http://webdisk.tacosmexican.com/uploads/1/3/0/7/130776439/2209566.pdf
    • http://www.iyasako.co.uk/uploads/1/3/0/6/130621141/3962421.pdf
    • http://guidoanthonincontino.com/uploads/1/3/0/6/130604730/2299658.pdf
    • http://roseg.net/uploads/1/3/0/6/130639263/262eb515b70c0.pdf
    • http://nw6.me/uploads/1/3/0/6/130605040/ruzupoge_zelobawovonosir_zefupu.pdf
    • http://thetherapynook.com/uploads/1/3/1/0/131070530/9cdf5bfb20f1.pdf
    • http://carousellearning.com/uploads/1/3/0/7/130739158/69b77b6.pdf
    • http://castsafe.com/uploads/1/3/0/4/130476795/64e82c686.pdf
    • http://mail.amsihvac.com/uploads/1/3/0/6/130620963/9897627.pdf
    • http://reconditionallove.com/uploads/1/3/0/5/130589427/vivisi_kuvefujajes.pdf
    • http://thecagewi.net/uploads/1/3/0/4/130436307/3521274.pdf
    • http://happi-me.org/uploads/1/3/0/6/130621776/5215c4a0d775.pdf
    • http://www.thebeachybuzz.com/uploads/1/3/0/6/130621176/3282040.pdf
    • http://govgraph.us/uploads/1/3/0/5/130546196/8962281.pdf
    • http://iparadiset.se/uploads/1/3/0/5/130550683/wolijawus.pdf
    • http://mail.az-telecom.com/uploads/1/3/0/5/130551653/tetotepuk.pdf
    • http://whatisthedifferencebetweena.com/uploads/1/3/0/6/130604162/vanabegu.pdf
    • http://tedxquotes.com/uploads/1/3/0/6/130621383/46006.pdf
    • http://thestarseedtribe.com/uploads/1/3/0/5/130544954/a80f3c3d9c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010864.bin
a02edd05e336b1bb59047eb2755506d22e68cdc28dd1d0b36702515b5b4d42cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 9832 bytes
font_01_sfnt_off00012da8.bin
0f8dca5bfeed5a7ebdfb88b99d57ef3699a6bb52aa052faf699c0959954caefa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA8 4620 bytes
font_02_sfnt_off00013db8.bin
5c6346ade964c8339558d92d6f36e1bbc483fe6e1d24bde5b3fa55d86c26cf28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB8 16904 bytes

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