Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99d3be2113b9d50…

MALICIOUS

PDF

32.7 KB Created: 2020-04-04 13:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2021-05-23
MD5: e8ac366bc696853812408fb493392496 SHA-1: de5d494804c1bdf80d372e0589f063910b1da82d SHA-256: d99d3be2113b9d5034cc91d12401a85b2c26a9170088c5f3d99350249a535632
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to potentially harmful content or to engage in link farming. The document body itself is largely unreadable, but the presence of URLs within it further supports the malicious intent.

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://nofone.net/uploads/1/3/1/1/131163935/131163935.html#como+el+ciervo+brama+letra+guitarra PDF link annotation
    • http://everywitchway.org/uploads/1/3/0/8/130874087/322554.pdfIn PDF document text
    • http://ninthdistrictdems.org/uploads/1/3/0/5/130589295/pokugemozo-ditapiduzox-retodaz.pdfIn PDF document text
    • http://accordinvestmentsllc.com/uploads/1/3/0/3/130379408/e59ed64ca8c7d7f.pdfIn PDF document text
    • http://crownpairings.com/uploads/1/3/0/5/130545434/9049957.pdfIn PDF document text
    • http://samnangernaeringsforum.com/uploads/1/3/0/4/130483096/mawarotalorukim.pdfIn PDF document text
    • http://cornonthecobaz.com/uploads/1/3/1/0/131070080/3910775.pdfIn PDF document text
    • http://newportheightsmc.com/uploads/1/3/0/5/130551096/7b4be.pdfIn PDF document text
    • http://eehatrainingconsultancy.net/uploads/1/3/0/3/130313405/7279213.pdfIn PDF document text
    • http://jennyandandy.com/uploads/1/3/0/4/130476006/7959467.pdfIn PDF document text
    • http://creativefercrosstechnology.com/uploads/1/3/1/3/131398532/pomelikag-wekenuzevogef.pdfIn PDF document text
    • http://omniway.me/uploads/1/3/0/7/130739933/gukajobozoxepikase.pdfIn 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000524d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x524D 9388 bytes
SHA-256: a95d294dd24fd68bbef6c446b1ccd9fa2d92fad0fc15b150d2fb348b023a5ed8

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