Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7aad0f1f9c82f5…

MALICIOUS

PDF

42.6 KB Created: 2020-05-19 19:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: eabeee327a5c449c772a5607146aa021 SHA-1: f44afdc265872692d6af8c45bc45ae028bb96395 SHA-256: 7b7aad0f1f9c82f539e7fff0a348bf14d9f22ee2706622285c357066b24d847a
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on unrelated domains, suggesting a link farm or a distribution mechanism for further malicious content. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this file. No scripts were extracted, but the primary attack pattern involves directing users to external resources.

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://pkupursuits.org/uploads/1/3/1/4/131407887/131407887.html#how+does+dota+2+calculate+hero+perfo PDF link annotation
    • http://vianestates.us/uploads/1/3/0/5/130551179/xizowijozeja-zijupemano-fodego.pdfIn PDF document text
    • http://jjjandkconstructionllc.net/uploads/1/3/1/4/131438242/4118718.pdfIn PDF document text
    • http://freelancinglaunchpad.com/uploads/1/3/0/7/130775858/puxelipi.pdfIn PDF document text
    • http://campoutbrand.com/uploads/1/3/0/4/130489359/luvukuresufavu_japuvesa_lifal_legijifu.pdfIn PDF document text
    • http://thymetolavender.com/uploads/1/3/0/5/130589312/190bf5b5f6e.pdfIn PDF document text
    • http://supersealusa.com/uploads/1/3/0/2/130289535/7173883.pdfIn PDF document text
    • http://coverallinteriors.com/uploads/1/3/1/3/131398540/pabakaxagemi_wojegi.pdfIn PDF document text
    • http://vapor-physics.com/uploads/1/3/0/9/130969446/jokorosazerepakuna.pdfIn PDF document text
    • http://xn--missangaffconstruo-itb3f.com/uploads/1/3/1/4/131437138/00cc3d.pdfIn PDF document text
    • http://justaddcolorcoaching.com/uploads/1/3/0/8/130874360/ditimateru.pdfIn PDF document text
    • http://paolacapelli.com/uploads/1/3/0/3/130379292/2d7a7b1ca747.pdfIn PDF document text
    • http://drumlessonswakefield.com/uploads/1/3/0/6/130604771/sodoravi_xafafewoxa_vibobari_roxij.pdfIn PDF document text
    • http://therealdavecarruthers.com/uploads/1/3/1/4/131437394/pewuw.pdfIn PDF document text
    • http://runsquadopo.org/uploads/1/3/0/7/130775123/betizasotaf_zubitiv.pdfIn PDF document text
    • http://inspirehabits.com/uploads/1/3/0/7/130739577/samafuzuxukaj.pdfIn PDF document text
    • http://wakeupthesoul.org/uploads/1/3/0/9/130968949/veminosenof.pdfIn PDF document text
    • http://coachforachievement.org/uploads/1/3/0/5/130539696/zuxuvolasu.pdfIn PDF document text
    • http://popknotevents.com/uploads/1/3/0/6/130620746/8179986.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9C 10268 bytes
SHA-256: b4936e8cd879e5eb296ae0d6f0660e1f0ea282f98336230afe4a45a933fd1ef3

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