Malicious PDF — malware analysis report

Static analysis result for SHA-256 873d27e6da557353…

MALICIOUS

PDF

32.2 KB Created: 2020-06-10 12:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 663cb69c0767f6396a8cfac2ffbb63fe SHA-1: 1c6e497833a1d8d90a1ca7016bb91f0086b58415 SHA-256: 873d27e6da557353380bfadcbd5584124562bdb33b19fcb6f3360f583f98f0b0
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged the document as malicious. These links are likely intended to manipulate search engine rankings or serve as a distribution mechanism for further malicious content, aligning with Ingress Tool Transfer.

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://rachelcooksketo.com/uploads/1/3/0/6/130639764/130639764.html#toy+story+grosero
    • http://emilymuirmain.com/uploads/1/3/0/5/130546415/6044678.pdf
    • http://autodiscover.contempophysicaldance.org/uploads/1/3/0/6/130603728/6453028.pdf
    • http://solesbeeco.com/uploads/1/3/0/4/130493389/vosevetibimajobekun.pdf
    • http://tweenattudeboutique.com/uploads/1/3/1/6/131606487/54f00c9aef.pdf
    • http://pidglobal.com/uploads/1/3/0/9/130969621/18e6f.pdf
    • http://fishinglakefirstnation.com/uploads/1/3/0/5/130588182/seran-lesowone.pdf
    • http://ayayogaart.com/uploads/1/3/1/6/131636960/jodagetimunama.pdf
    • http://edureacheducation.org/uploads/1/3/1/4/131410167/66cd72d8a6.pdf
    • http://myetinfo.com/uploads/1/3/0/7/130739026/1625169.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://lejixubut.files.wordpress.com/2020/06/xuwevazapenezivanebigutu.pdf
    • https://kibawof.files.wordpress.com/2020/06/gomukefubiroso.pdf
    • https://xikijowo.files.wordpress.com/2020/06/dozudekofixidodibirupap.pdf
    • https://wezapesipoda.files.wordpress.com/2020/06/kavamamugiwusajepofojized.pdf
    • https://ziwemukivi.files.wordpress.com/2020/06/rolixamosefukufamiji.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050b6.bin
3e37b55a4d15e7451b95e279c09fb3c4f923d4680447026da6a2096bb0b07be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50B6 11228 bytes

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