Malicious PDF — malware analysis report

Static analysis result for SHA-256 01dcb0deae196681…

MALICIOUS

PDF

41.3 KB Created: 2020-03-29 11:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c46cabecdffbcc979a9e741cc1ff458a SHA-1: 5567c00f088b8120fa929c08cef6be3d0d47ee47 SHA-256: 01dcb0deae19668142d3e2bc601241e02964286a864edbab9cb0a980b9204221
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, suggesting it was programmatically generated. The primary attack pattern involves directing users to a vast array of external URLs, likely for SEO spam or to host further malicious content.

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://nobuhotelshoreditch.devsite-1.com/uploads/1/3/0/2/130291662/130291662.html#two+day+juice+cleanse+whole+foods
    • http://krivak.com/uploads/1/3/0/2/130273738/vugiwobuwovis.pdf
    • http://tasmantranscription.com/uploads/1/3/0/5/130590637/2fad3d710.pdf
    • http://profesionallashes.com/uploads/1/3/1/4/131407668/48332980bb209.pdf
    • http://kepishopee.online/uploads/1/3/0/7/130739082/modipebepumune.pdf
    • http://fuckyellowsweater.com/uploads/1/3/0/2/130291371/bukez-fekexobok-zakujiku.pdf
    • http://cjministry.org/uploads/1/3/0/2/130270957/4337886.pdf
    • http://autismdayschool.com/uploads/1/3/1/4/131406369/96ea7cfa.pdf
    • http://iamfree2b.net/uploads/1/3/0/3/130324170/9625776.pdf
    • http://stannelofts.net/uploads/1/3/0/7/130775200/faxovi-vawubeweniwetu.pdf
    • http://shoplunaandlillies.com/uploads/1/3/0/6/130604477/642b3d4b3250.pdf
    • http://frankyabundes.com/uploads/1/3/0/2/130272478/4659651.pdf
    • http://bogadancers.com/uploads/1/3/1/3/131379033/zibez-zupavoxinemibak.pdf
    • http://abby-harris.com/uploads/1/3/0/4/130435722/rogodaxuduzun-fitikojod-nidebejo.pdf
    • http://adamselementarygear.com/uploads/1/3/1/0/131070651/8839236.pdf
    • http://snapchathoes.shop/uploads/1/3/0/7/130775753/5721867.pdf
    • http://superiorcartcompany.com/uploads/1/3/0/6/130620213/ketoborizoxonixi.pdf
    • http://tedxyouthcvf.com/uploads/1/3/0/6/130621025/6cb140908.pdf
    • http://atyourservicehvac.org/uploads/1/3/0/4/130435638/bidela.pdf
    • http://pbwj.org/uploads/1/3/0/5/130588586/nezap.pdf
    • http://freescholarships.site/uploads/1/3/0/7/130775634/maxitedugirolebutek.pdf
    • http://necessitiesboutique109.com/uploads/1/3/0/2/130272848/f092a1de.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_off00007789.bin
cdafef959a61c8bc3a26ee3ca2d6d9b19bbc777c18bb4bc105f64b59920e80c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7789 8352 bytes

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