Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bedad5a34536a70…

MALICIOUS

PDF

40.3 KB Created: 2020-03-25 07:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ad0aa6e278387d70b7d2a07b81bc9be1 SHA-1: 4a31fea54b42b9314355352149d4c9949596992f SHA-256: 6bedad5a34536a7046ab5379087c189ce8c9e841e75f172366bc2dda1721ca0a
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains URLs that are also present in the list of extracted URLs. This suggests the primary purpose is to redirect users to a network of linked content, potentially for SEO manipulation or to serve as a distribution point for further malicious payloads.

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://alexandravictoria.net/uploads/1/3/0/7/130739850/130739850.html#how+to+draw+statistical+process+control+charts+in+excel
    • http://historyproject.net/uploads/1/3/0/6/130639745/xunokebamobaz.pdf
    • http://valuegun.com/uploads/1/3/0/6/130639608/bodusiriduniwuronus.pdf
    • http://aeronave.com.br/uploads/1/3/0/5/130589269/1503141.pdf
    • http://emmaatterbury.com/uploads/1/3/0/5/130551126/790559.pdf
    • http://sort-it-now.com/uploads/1/3/0/2/130270931/litoditokis.pdf
    • http://yourcruisetoremember.com/uploads/1/3/0/7/130775918/zorobeze.pdf
    • http://mailbear.org/uploads/1/3/0/4/130483184/zofanor.pdf
    • http://walkerhvac.org/uploads/1/3/0/5/130543377/267012.pdf
    • http://integritymke.com/uploads/1/3/0/4/130436239/265472.pdf
    • http://onestopindustrial.net/uploads/1/3/0/6/130605176/3ef33b2791.pdf
    • http://annieluchsinger.com/uploads/1/3/0/6/130604388/43832b070.pdf
    • http://www.robertholmesguitars.co.uk/uploads/1/3/0/7/130738881/dopikuribofi.pdf
    • http://junioroilpaintingworkshop.com/uploads/1/3/0/6/130620348/521b5c89e.pdf
    • http://mail.dancedynamicsmemphis.com/uploads/1/3/1/0/131070054/linejojiviminaxo.pdf
    • http://www.modernfencingcrew.com/uploads/1/3/0/4/130490977/falup.pdf
    • http://dailygoogletips.com/uploads/1/3/0/7/130738835/9974746.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_off00006fcc.bin
0054f2c827f9b3b52bd217adc9789f8a09a9f0e3541507d79dbece3e07a65281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCC 8960 bytes

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