Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf99fc0efab1441…

MALICIOUS

PDF

47.2 KB Created: 2020-03-30 12:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ea452c8ef12e87bee94e93be08c35b30 SHA-1: 25a15f4c40b56d030c9f80a27da5b29a1c734524 SHA-256: 4bf99fc0efab1441617e415a2579c8c2b3bfb76c86b386fbb276e499799347c7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.001 PowerShell

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, suggests an educational theme, likely a lure to disguise the malicious intent of directing users to a link farm. No scripts were extracted from this sample.

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://74-123-73-16.mgwnet.com/uploads/1/3/0/6/130620195/130620195.html#preguntas+sobre+historia+para+ni%C3%B1os+de+primaria
    • http://chixcakes88.com/uploads/1/3/0/2/130289748/9000630.pdf
    • http://thecrossoverstocktie.com/uploads/1/3/0/7/130775705/nopijunalofavuz.pdf
    • http://southernsem.com/uploads/1/3/0/6/130621523/246d42b128ae.pdf
    • http://reconnectyouth.org/uploads/1/3/1/3/131379389/pomizexu.pdf
    • http://tonychristelleducational.org/uploads/1/3/0/5/130550985/pawekub-xumonekawidade-dukenun.pdf
    • http://upordownatl.com/uploads/1/3/0/4/130490338/xezufukozolan.pdf
    • http://anger-management-coach.com/uploads/1/3/0/8/130874119/funekinesakabejediga.pdf
    • http://marlayparktipsters.com/uploads/1/3/0/7/130739830/rofofol.pdf
    • http://regisrealtygroup.com/uploads/1/3/1/3/131380433/7817488.pdf
    • http://pacepisodes.com/uploads/1/3/0/6/130639298/bosom.pdf
    • http://propowerwashingllc.com/uploads/1/3/0/8/130874325/bixeri_dozafe_moxolawuni.pdf
    • http://theraphil.net/uploads/1/3/0/3/130313294/8042be7a.pdf
    • http://shiatsumarikatuhkala.com/uploads/1/3/0/3/130323674/leledajamamar-vevubesozi-daxokagi-fuzazibejox.pdf
    • http://accjcsfund.org/uploads/1/3/0/5/130538953/tubotamuvag.pdf
    • http://superiorautoconnections.net/uploads/1/3/0/4/130483537/1827575.pdf
    • http://theshogroup.com/uploads/1/3/0/6/130604039/mawivizifuzubasax.pdf
    • http://devonhouseandhounds.com/uploads/1/3/1/3/131384468/webilalufopo_paposene_repugumixizeja_rexuledomovava.pdf
    • http://clovergenotyping.com/uploads/1/3/0/2/130288798/8018615.pdf
    • http://thehumancult.com/uploads/1/3/0/6/130639561/fokiw_vopovoretozum.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_off00008bf2.bin
5c6f2d76485503f72bd54a94d3c53e2f5c88639c375f1467d9b4c05adf050879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF2 9144 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.