Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0ada36f54f07ed…

MALICIOUS

PDF

40.9 KB Created: 2020-04-02 11:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a9ea9c035d8afe750c9a210c57cff06a SHA-1: 601840b75dc0c327a41bd220bd69f6b1a6cc9661 SHA-256: 5f0ada36f54f07ed9788df6e859256bc352db907d3b461bc9639361c7d00fc16
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure suggests a link farm or SEO poisoning attempt, potentially leading to malicious content or phishing pages.

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://careaidecommunity.com/uploads/1/3/1/4/131438036/131438036.html#ejemplos+de+ensayos+expositivos+pdf
    • http://artisanfoodco.ca/uploads/1/3/0/7/130775135/wupen.pdf
    • http://groupmainst.com/uploads/1/3/0/9/130969334/4267206.pdf
    • http://allriversidehomes.com/uploads/1/3/0/5/130545565/vabitapomerol-nefapipopepinev.pdf
    • http://jtgreenteam.com/uploads/1/3/0/7/130774962/wefipiwamofodi.pdf
    • http://www.1stumcstudentministries.org/uploads/1/3/0/8/130874281/litorepizuzuroguzevi.pdf
    • http://symphoniaseries.com/uploads/1/3/0/6/130639706/4699942.pdf
    • http://unclejohnshandyman.com/uploads/1/3/1/3/131383760/7591739.pdf
    • http://campbellsgifts.net/uploads/1/3/0/2/130291471/toregemupazulobasa.pdf
    • http://nblbball.com/uploads/1/3/0/4/130490386/7943728.pdf
    • http://roofrepairmobileal.com/uploads/1/3/0/7/130775984/dokena.pdf
    • http://herdthelove.com/uploads/1/3/0/6/130639532/3113786.pdf
    • http://pizzlepaints.com/uploads/1/3/0/9/130969198/3442aa6cbdd6.pdf
    • http://scribejar.com/uploads/1/3/0/9/130969297/1313524.pdf
    • http://irmajace.com/uploads/1/3/0/6/130640208/8126736.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_off00007712.bin
40bc93f838ad932758c5a4de3b38866bd7daaac983b61a7a20265049ac8020cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7712 8648 bytes

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