Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffde310e2f88935…

MALICIOUS

PDF

42.3 KB Created: 2020-04-12 21:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: faa2b025a61a351d5fa7cbdf737a8d4c SHA-1: 91decf81aea3a70f0f1d396be20ac742da82d634 SHA-256: dffde310e2f88935e0f5863c543be9f71af3a6e89bcf26f83a4c8a5ab89c0d44
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The document body text is largely unreadable due to encoding issues, but the presence of numerous external links suggests a malicious intent to redirect users or host further malicious content.

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://purelinewellness.com/uploads/1/3/1/4/131437444/131437444.html#objetivos+de+la+capacitacion+del+personal
    • http://valflag.com/uploads/1/3/0/2/130272501/7551c38aa2d.pdf
    • http://justhavinghersay.net/uploads/1/3/0/6/130620511/9364353.pdf
    • http://ecproperty.net/uploads/1/3/1/4/131406804/sofatuganoleru_wukanowaxukixex_zebudekaxe.pdf
    • http://feightnerconsulting.com/uploads/1/3/0/5/130588390/d3fffe.pdf
    • http://anthonymvassallo.com/uploads/1/3/1/4/131454603/2730948.pdf
    • http://medpro-homes.com/uploads/1/3/0/2/130274338/fegudoj.pdf
    • http://connectingdevelopers.com/uploads/1/3/0/6/130604299/biritaxoti-mekupun-zujabakizadet-kubalofi.pdf
    • http://coneyislandgenerationgap.com/uploads/1/3/1/4/131438438/4b599b476f245.pdf
    • http://lakarolakintana.com/uploads/1/3/0/4/130476114/ponapijaxoxikuxa.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_off00007a5a.bin
7f198d970b90134571bc6a94da49374e14beb4944e41476420ee03590f5601d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5A 9096 bytes

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