Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20b826647307fa5…

MALICIOUS

PDF

39.5 KB Created: 2020-03-14 14:21:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 21dea0c882886b7ba99881558af7ea84 SHA-1: 2078c0ca77bc2020ddfc556b9371e0f9f0d694bf SHA-256: f20b826647307fa5cc02d86cb82691a44582bf4731a46c7885c6241dbbec32a8
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to PDF files on various domains. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that appears to be a lure related to medical terms, suggesting a deceptive content strategy. The primary attack pattern involves redirecting users to a network of potentially malicious websites.

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://vbya9.slpny.com/uploads/1/3/0/6/130603975/130603975.html#bradycardia+full+form+in+medical+term
    • http://piercepeacockproductions.com/uploads/1/3/0/5/130543045/pexivasat.pdf
    • http://charlottepropertync.com/uploads/1/3/0/6/130639554/babozobiwizonog.pdf
    • http://hostmaster.filini.de/uploads/1/3/0/2/130289595/jokopajerasimawoka.pdf
    • http://envt225malta2019.com/uploads/1/3/0/5/130590739/besorakomosa.pdf
    • http://lialin.co.uk/uploads/1/3/0/4/130488979/e17607e015.pdf
    • http://peaceofmindchildcarestaffing.com/uploads/1/3/0/6/130639178/wevutipezakakotaf.pdf
    • http://www.collingwoodpsychotherapy.com/uploads/1/3/1/1/131163853/fafopowozezemi-gopefezakegemo-nokero.pdf
    • http://www.mail.panterracoach.com/uploads/1/3/0/4/130483242/mekuseneg.pdf
    • http://www.aymeezus.com/uploads/1/3/0/6/130604892/3198408.pdf
    • http://shardworld.com/uploads/1/3/0/6/130640144/83133686369.pdf
    • http://www.emmavandesteenekamer.com/uploads/1/3/0/2/130273962/0f95b43fedbf.pdf
    • http://www.thewaywomen.com/uploads/1/3/0/7/130776889/2096404.pdf
    • http://pop.lightenupwithliz.com/uploads/1/3/0/5/130540097/zilewisunadorun.pdf
    • http://veteransmusicfest.com/uploads/1/3/0/6/130621342/2596567.pdf
    • http://ideacreativedemo2.com/uploads/1/3/0/8/130874565/julezixolijuwo.pdf
    • http://www.aquatic16.fr/uploads/1/3/0/7/130739833/vujivudi.pdf
    • http://tricityadvertisingcandy.com/uploads/1/3/0/5/130539085/sotoxesarojig.pdf
    • http://hyperdrivestudio.net/uploads/1/3/0/6/130639377/wefiki.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_off00007351.bin
dd8304efeb097d4bee3ed022104301f13aa28977c56f3dbd03051b08d5a6b901
pdf-font-stream PDF embedded font (sfnt) at offset 0x7351 7464 bytes