Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a235ef395111c09…

MALICIOUS

PDF

38.5 KB Created: 2020-06-14 11:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccbde33d2c746c6802366b56cf5aaae6 SHA-1: ee9ebedbf399542da556c8f856b10a3108407802 SHA-256: 7a235ef395111c093c131cfa3d086694035850ea5f63f2b0df1d33c30c2e69bd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to domains designed to appear as legitimate content repositories. The document body mentions 'Avian influenza pdf' and includes URLs that are likely part of an SEO link farm or a phishing lure. The ML classifier strongly indicated maliciousness, supporting the interpretation of these links as part of a malicious campaign.

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://texasbusinessreviews.com/uploads/1/3/0/7/130776521/130776521.html#avian+influenza+pdf
    • http://bears2u.com/uploads/1/3/1/1/131164568/gilitulifetupew.pdf
    • http://sanfranciscopeacetreaty.org/uploads/1/3/0/7/130775145/gegufifebagubi_tubazakupimulo_meguvuluvukum_riwapubozobez.pdf
    • http://junshikaiin.work/uploads/1/3/0/5/130540401/ropet.pdf
    • http://zeolifineart.com/uploads/1/3/0/6/130620341/13d32ffa.pdf
    • http://mobile.jobonship.org/uploads/1/3/1/3/131381900/fifisilo.pdf
    • http://hostmaster.portugal-spainmarinesurveys.com/uploads/1/3/0/3/130313002/kofizewomodij.pdf
    • http://sanfranciscopeacetreaty.org/uploads/1/3/0/7/130775145/gegufifebagubi_tubazakupimulo_meguvuluvukum_riwapubozobez.p
    • https://kuziwugajeko.files.wordpress.com/2020/06/gedirigafo.pdf
    • https://sivutis.files.wordpress.com/2020/06/lutupinivavof.pdf
    • https://jinotazataga.files.wordpress.com/2020/06/funowu.pdf
    • https://rufutekinose.files.wordpress.com/2020/06/gowono.pdf
    • https://kiwekesumi.files.wordpress.com/2020/06/fosotesagofoj.pdf
    • https://vimagifa577894512.files.wordpress.com/2020/06/parubunifidolixowopiz.pdf
    • https://mukeninesev.files.wordpress.com/2020/06/57155952794.pdf
    • https://robizuwe.files.wordpress.com/2020/06/vadobupujujo.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_off00006b86.bin
4e7e3878d6659113abf70776ceddc7d7a050ce32e1183f320f712ec5e76bca8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B86 10312 bytes

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