Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c886d4c180f0a50…

MALICIOUS

PDF

50.4 KB Created: 2020-03-24 05:38:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f1b837863491cb034a202facd0362543 SHA-1: 8e0a729a8fd54030c4a531076aab4f2ec32ed1ba SHA-256: 0c886d4c180f0a502b9b59f6e0eb34d0da482907a8201eeeddbfcb149cdea509
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic identified a mass of external PDF links. While no scripts were explicitly extracted, the presence of numerous URLs suggests an attempt to lead the user to potentially harmful 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://marilusdesigns.com/uploads/1/3/0/4/130476896/130476896.html#two+most+important+pistol+shooting+fundamentals
    • http://www.mdprostart.com/uploads/1/3/0/6/130639426/2680657.pdf
    • http://www.shopnmybag.com/uploads/1/3/0/3/130379244/nojasogepofaxa.pdf
    • http://www.threeseedsofchange.com/uploads/1/3/0/4/130436204/kopurid.pdf
    • http://kansascityparacon.net/uploads/1/3/0/6/130640028/taxakela-radumogikexokul-tanunigizapago.pdf
    • http://mamaintheraw.com/uploads/1/3/0/6/130621345/472079c0f4420.pdf
    • http://nationalcasinomarketing.com/uploads/1/3/0/6/130620712/lopeto-gukiwetojejira-sagerok.pdf
    • http://amberpknight.com/uploads/1/3/0/2/130289433/15f7a6af72e3.pdf
    • http://amoshgiftbaskets.net/uploads/1/3/0/4/130483491/7207374.pdf
    • http://www.kingsleyfrancis.com/uploads/1/3/0/5/130552016/9d0fcb6fa1c.pdf
    • http://artesanias.store/uploads/1/3/0/3/130379362/ritonevalefesebetop.pdf
    • http://jdstudy.net/uploads/1/3/0/3/130313221/ligukom_gebosi_gasovirogus.pdf
    • http://stems2.org/uploads/1/3/0/7/130776769/5857910.pdf
    • http://mail.glenmoreyorkies.com/uploads/1/3/0/4/130436140/tatemi.pdf
    • http://oggirreesoccer.com/uploads/1/3/0/2/130288630/tiwolage.pdf
    • http://stingraysbaseballclub.com/uploads/1/3/0/7/130776253/6c788ba233208d.pdf
    • http://marcelastraub.com/uploads/1/3/0/7/130776420/levelitagulira_toxusabavima.pdf
    • http://truedeflab.com/uploads/1/3/0/7/130775462/jogeninekutef_tolisuluw_sojapil.pdf
    • http://www.moderndaymira.com/uploads/1/3/0/6/130639528/pegapewerupevumodebo.pdf
    • http://804460431759115818.square.site/uploads/1/3/0/3/130313524/totar_jomawilajobetap.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_off00009ac0.bin
bf65b86eecc4a818c7e0d6d62eb318feec5aa1ad97f1fb5fb47f729a9e79b6a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC0 8256 bytes

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