Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d4cdff9edf8e8b…

MALICIOUS

PDF

39.5 KB Created: 2020-03-27 05:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: 534dac42052cb3a64420ddc2efaa31f1 SHA-1: db8b13371860d440d642e8dda70b4240a76c1cef SHA-256: c2d4cdff9edf8e8b8fa967dfe1c1ad465ed66a1dcaec9dc64ef6976dfdd70375
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

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 different domains, suggesting a link farm or SEO spam campaign. The document body itself is largely unreadable, but the presence of numerous external links is the primary indicator of malicious intent. No scripts were extracted from this sample.

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://transition-2.org/uploads/1/3/0/7/130740145/130740145.html#que+son+los+cinco+sentidos+para+ni%C3%B1os PDF link annotation
    • http://www.cannasbestdepot.com/uploads/1/3/0/6/130621425/kemejije.pdfIn PDF document text
    • http://mlstourney.com/uploads/1/3/0/2/130289225/xisavazodeba.pdfIn PDF document text
    • http://mta-sts.siloamyouth.com/uploads/1/3/0/7/130738623/pawut.pdfIn PDF document text
    • http://comedywonder.com/uploads/1/3/0/8/130874220/miwamaxereb.pdfIn PDF document text
    • http://www.at-beach.com/uploads/1/3/0/4/130493248/jurejewux.pdfIn PDF document text
    • http://phoenix-academy.org/uploads/1/3/0/8/130814145/rimimebo.pdfIn PDF document text
    • http://slamgirlsmusic.com/uploads/1/3/0/6/130604983/nufivibixugosusojal.pdfIn PDF document text
    • http://adsl-63-204-18-27.benefitplans.org/uploads/1/3/0/6/130639815/8070975.pdfIn PDF document text
    • http://joaandjames.love/uploads/1/3/0/4/130490681/ribereguziv.pdfIn PDF document text
    • http://artsjamkids.com/uploads/1/3/0/5/130589194/7712595.pdfIn PDF document text
    • http://icconic.com/uploads/1/3/0/6/130605519/388d7a43770205.pdfIn PDF document text
    • http://dawnoverthemoon.com/uploads/1/3/0/6/130621557/2325375.pdfIn PDF document text
    • http://myhealthcareadministration.com/uploads/1/3/0/6/130639710/tupunekuzagixuwaru.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_off00006fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDF 8588 bytes
SHA-256: 90f84c0784a97ca63ba3710a1356a6b5de93e06619c4e48cfd9267c24f8a714b