Malicious PDF — malware analysis report

Static analysis result for SHA-256 55764f7e63a110c8…

MALICIOUS

PDF

28.3 KB Created: 2020-06-01 11:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e40a7823c9a36f05189d292641af6658 SHA-1: 218bd75d15577db0bc1ca9768cf475111153c62e SHA-256: 55764f7e63a110c8216b17b1545a15a7a478025b7a94e592a70c841ff5509364
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains. This behavior is indicative of a link farm or a dropper mechanism designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute malware or phish for credentials through the linked PDFs. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8427402-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8427402-0
  • 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://gray-capital.com/uploads/1/3/0/5/130589442/130589442.html#dowland+lachrimae+pavan+sheet+music
    • http://biapuestadelsol.com/uploads/1/3/0/8/130813381/zited_nexajefobafak_watunozewudel_danixi.pdf
    • http://sekolahkreatifindonesia.com/uploads/1/3/1/4/131411411/moguresiduj.pdf
    • http://fostersplacedover.com/uploads/1/3/0/7/130739000/pejirira.pdf
    • http://sgwfl.com/uploads/1/3/0/5/130589239/labusolijapil_rugux.pdf
    • http://aerodronetechnologies.com/uploads/1/3/0/6/130639939/vupebibotako_jemiserofojate_sezirik_kipisajalogek.pdf
    • http://flux-functional.com/uploads/1/3/1/6/131606115/56088.pdf
    • http://laevasion.com/uploads/1/3/1/1/131163960/gugiwim.pdf
    • http://lotsforsalellc.com/uploads/1/3/0/6/130639776/2983716.pdf
    • http://designroom.studio/uploads/1/3/0/6/130621101/vipexuvidexuvogule.pdf
    • https://mokabax.files.wordpress.com/2020/05/damufogadosijaganelevudi.pdf
    • https://valojime.files.wordpress.com/2020/05/kalufuxis.pdf
    • https://sujefeg.files.wordpress.com/2020/05/93801406654.pdf
    • https://sabuninovaju.files.wordpress.com/2020/05/36537457722.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_off0000471e.bin
0aad0301d5c1916941b20f7a61b96144d37f0ed499e9e789004392ba32ec031a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x471E 9004 bytes

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