Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc2dbf3425b012e…

MALICIOUS

PDF

54.2 KB Created: 2020-03-25 03:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db9c16dfa94652f4d9407a6f15106baf SHA-1: a29935cf08cc85170ef1daa78ae8b7b101bfb5db SHA-256: 8bc2dbf3425b012e9c34a48986eefcd7086d38967fd1346bb1e8340c3c0b06c1
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text but also includes some of the URLs, reinforcing the link farm hypothesis. No scripts were extracted, limiting the analysis of direct payload delivery.

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://ericmichaeleisner.com/uploads/1/3/0/9/130968976/130968976.html#sharp+ion+plasmacluster+25000
    • http://lovehouse.org/uploads/1/3/0/7/130740498/rufamegawa.pdf
    • http://earthkween.net/uploads/1/3/0/5/130543784/pokaje.pdf
    • http://healthyskinformulacream.com/uploads/1/3/0/2/130288301/wekom.pdf
    • http://productionfront.net/uploads/1/3/0/5/130539111/nogorat.pdf
    • http://tateautomate.com/uploads/1/3/0/4/130490245/fe93ca85.pdf
    • http://www.jennifer-woods.co.uk/uploads/1/3/0/6/130604090/tikaxapepal.pdf
    • http://soundlord.com/uploads/1/3/0/7/130775109/patikamozorukefoso.pdf
    • http://ohhousecleaners.com/uploads/1/3/0/6/130605198/tesuvuvixogoxo.pdf
    • http://knoxfoodtours.com/uploads/1/3/0/6/130639939/vogeda-xurefosobiba-lotex.pdf
    • http://www.kangedefa.com/uploads/1/3/0/4/130435706/masovuliwi.pdf
    • http://hostmaster.alisonlawrence.com/uploads/1/3/0/8/130813510/godedabuxi.pdf
    • http://bitcoinserv.co.uk/uploads/1/3/0/6/130639945/2082421.pdf
    • http://kinkydreamspress.com/uploads/1/3/0/5/130545698/affd73b22866.pdf
    • http://imageprizes.com/uploads/1/3/0/6/130621082/sisobidadet.pdf
    • http://nationalpoolinspection.com/uploads/1/3/1/0/131069970/6479344.pdf
    • http://giuliosterbinisounddesign.com/uploads/1/3/0/5/130550654/gufujuwu.pdf
    • http://lavlabbodycare.com/uploads/1/3/0/6/130604765/lovofujola.pdf
    • http://thesmilegallery.org/uploads/1/3/0/9/130970016/9df7b0ebe65f.pdf
    • http://www.leilanisheart.com/uploads/1/3/0/5/130543552/2292c18bd8694a.pdf
    • http://c1r.us/uploads/1/3/0/2/130289778/752422666c6b6.pdf
    • http://www.odttroucayman.org/uploads/1/3/0/5/130551129/24f2479a6f.pdf
    • http://minnataylor.com/uploads/1/3/0/7/130739926/6259079.pdf
    • http://alexraco.org/uploads/1/3/0/5/130544243/nuxakemuwepagunasemo.pdf
    • http://fincadeya.com/uploads/1/3/0/5/130539440/9348458.pdf
    • http://www.richarddomurat.com/uploads/1/3/0/8/130874002/d70f9fb3e5701.pdf
    • http://www.richarddomurat.com/uploads/1/3/0/8/130874002/d70f9fb3e5701
    • 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_off000083e8.bin
af732181f1043aa9fcb90f02128799e2aa28c403810a8e76cd68ac18403f01f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E8 10956 bytes
font_01_sfnt_off0000a70a.bin
c0aa45f48d1eeb72b608628efff3839b94b90c8c6364599dd0bb05e4ce874510		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA70A 24132 bytes

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