Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4da274a50bdd358…

MALICIOUS

PDF

32.8 KB Created: 2020-05-16 01:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 155a48b27eb053d6bc29122d4595151e SHA-1: 1366f8fa546c6cab9c119844eeebe5b7735be0b5 SHA-256: c4da274a50bdd35894031cb4b9f9fb0dcf8e82b3e0cc8fd2dea9140edd830e8c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content. The document body, though partially corrupted, contains text related to a 'commercial sublease agreement template' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to entice users to click on the embedded links. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bridgestreampublishing.com/uploads/1/3/0/5/130550729/130550729.html#commercial+sublease+agreement+template+word
    • http://talkfooddenver.com/uploads/1/3/1/4/131482867/xafakules-nunegusoso-zixariz-jenisux.pdf
    • http://manzilcommunications.com/uploads/1/3/0/5/130590322/6532758.pdf
    • http://upthewall.org/uploads/1/3/0/5/130542909/gifiv-terilejigufuje-venokekujomonex-jeturutaku.pdf
    • http://jeffreynowlinscultpure.us/uploads/1/3/0/7/130776630/mixoponopo-ruxoperopo-tubulej.pdf
    • http://indiamarilyn.com/uploads/1/3/1/3/131380120/36465eeb7.pdf
    • http://wellwithacupuncture.com/uploads/1/3/0/2/130271081/40a9b0db8d65747.pdf
    • http://zandali-dominion.com/uploads/1/3/1/3/131381167/kesuvasefotelafi.pdf
    • http://happytechscore.com/uploads/1/3/0/4/130483645/rotijekejux.pdf
    • http://clarksurveyor.com/uploads/1/3/0/6/130604370/pelutogupal.pdf
    • http://cliniquedelasciatiquerep.com/uploads/1/3/0/2/130291579/4132345.pdf
    • http://stackrealestatellc.com/uploads/1/3/0/7/130740508/5943512.pdf
    • http://winterparkpaws.shop/uploads/1/3/1/4/131437161/6d3d5a93d5ade5b.pdf
    • http://nuigmedicalsociety.com/uploads/1/3/0/4/130483638/2673433.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_off00005635.bin
d74d4a193f00b4a99df4b6c7b239a7006cc4c636a186d1d84a354c6395636bb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5635 9752 bytes

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