Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d513baf78ae46d0…

MALICIOUS

PDF

36.5 KB Created: 2020-03-30 06:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1460520d28a0609ce6766e0a38e498c6 SHA-1: 0b517fb07cd371eae562a3817bc65f5b46702717 SHA-256: 6d513baf78ae46d00586d17e493e417a669f1b935c49ce17b7be2b72014e4460
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file exhibits characteristics of a link farm, embedding a large number of external URLs pointing to other PDF documents across various domains. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links. The primary goal appears to be directing users to these external resources, which could be 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://asociacionperiodistaspr.org/uploads/1/3/0/7/130776630/130776630.html#four+spiritual+laws+of+evangelism
    • http://winningwithgoals.com/uploads/1/3/0/9/130969277/6270966.pdf
    • http://elohimcosmeticos.com/uploads/1/3/0/8/130813869/4cb8a4.pdf
    • http://claviascommunity.com/uploads/1/3/0/4/130488332/f6b05.pdf
    • http://dressscore.com/uploads/1/3/1/3/131380001/57d97.pdf
    • http://motitaweb.org/uploads/1/3/0/3/130323532/3ead4cbc528f.pdf
    • http://josephrossiter.com/uploads/1/3/0/5/130589299/xamot.pdf
    • http://vayonnaise.com/uploads/1/3/0/7/130775997/rasiw-bewuferikopixa-tiwitaduzap.pdf
    • http://longroadtrans.net/uploads/1/3/0/2/130287266/vepizedesamisosaju.pdf
    • http://consult-entech.com/uploads/1/3/0/9/130969177/67f8cb72bd667.pdf
    • http://kyoto-japan-django.club/uploads/1/3/0/7/130740011/fimukupiv_favemetigipo.pdf
    • http://usataiyaki.com/uploads/1/3/0/7/130739062/47e0d100e1.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_off000066e7.bin
167da48a2fa5e9a97df0c5fbcc6a1db0a44ee28e26bff4282e248355c0b7ace6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E7 7772 bytes

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