Malicious PDF — malware analysis report

Static analysis result for SHA-256 23318c50a33af722…

MALICIOUS

PDF

36.4 KB Created: 2020-03-21 20:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-10
MD5: ff995589053cd5b41f030033b9ff9be8 SHA-1: 6833dd2f4eb685cc238f4c55f16152f432c82ad6 SHA-256: 23318c50a33af7222c3cf0f64c879fcecbfa92de3848b7e2385317064df897d7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded external links, identified as a PDF link farm. The ML classifier strongly indicated maliciousness, and the embedded links suggest an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://crittenphotography.com/uploads/1/3/0/8/130874217/130874217.html#que+es+un+lenguaje+figurado+ejemplos PDF link annotation
    • http://coachtosuccess.co.uk/uploads/1/3/0/9/130969085/rutavegudimegu.pdfIn PDF document text
    • http://myturkishcoffee.com/uploads/1/3/0/5/130588487/4021299.pdfIn PDF document text
    • http://buggysplumbing.com/uploads/1/3/0/5/130539102/1079514.pdfIn PDF document text
    • http://kristinw.com/uploads/1/3/0/3/130323268/6b0faebf00.pdfIn PDF document text
    • http://itsaboutgiving.net/uploads/1/3/0/2/130291040/zusevulatid_dodixadisotiv_razul_jawekunerudofu.pdfIn PDF document text
    • http://www.mean-muggin.com/uploads/1/3/0/3/130324011/gumetebaj_ziroxave_bufixines.pdfIn PDF document text
    • http://ssrmincfl.com/uploads/1/3/0/5/130588280/pelanekene.pdfIn PDF document text
    • http://maralynhargrove.com/uploads/1/3/0/3/130313148/naguto.pdfIn PDF document text
    • http://www.guitartripp.net/uploads/1/3/0/4/130435583/8753560.pdfIn PDF document text
    • http://balisurftours.info/uploads/1/3/0/7/130740368/6844043.pdfIn PDF document text
    • http://sensiblesourcing.com/uploads/1/3/0/2/130270904/6010898.pdfIn PDF document text
    • http://galvagnik.com/uploads/1/3/0/5/130590507/8e771ec92b9f4.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_off000066b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B1 7764 bytes
SHA-256: 78a2e2c1ca08186f4aa3007a130dfccaee2c25e961107a4ddefa21b3a6d08e93