Malicious PDF — malware analysis report

Static analysis result for SHA-256 88231f71357f318f…

MALICIOUS

PDF

37.8 KB Created: 2020-03-22 12:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b2b5e1aeb5317597d1bf9b92df5bdf48 SHA-1: d8fa5cef967d2fe4b6ea174cbac3277c611b6fc3 SHA-256: 88231f71357f318fa4dd894cc608d6f7337eb7b058b144ecf9a83000dfe097b0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file contains a large number of embedded external links to other PDF files hosted on various domains. This technique is often used for SEO spam or to distribute malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. No scripts were extracted, but the sheer volume of external links suggests a malicious intent to redirect the user to potentially harmful content.

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://witherlysgreenhouse.com/uploads/1/3/0/7/130776164/130776164.html#10+palabras+con+familia+l%C3%A9xica
    • http://wortechautomacao.com.br/uploads/1/3/0/7/130740090/4301660.pdf
    • http://ianfriedmanlaw.com/uploads/1/3/0/4/130476597/7264666.pdf
    • http://mydivineinspirations7.store/uploads/1/3/0/7/130776105/2132083.pdf
    • http://academicyoga.com/uploads/1/3/0/5/130545998/gevotaluv_lefewixujorufof.pdf
    • http://justbenz.com/uploads/1/3/0/4/130491850/5040391.pdf
    • http://miiasoey.com/uploads/1/3/0/7/130775624/9498328.pdf
    • http://touchtypefilms.com/uploads/1/3/0/5/130589057/785287af1e77f03.pdf
    • http://breakthecodewebdesign.com/uploads/1/3/0/4/130435688/e5986357da.pdf
    • http://maintenance-men.org/uploads/1/3/0/2/130289719/kuwifunofefaf_jugasemuzitim_zomujufosomipe.pdf
    • http://sofievanoosthuyse.com/uploads/1/3/0/7/130775776/jebaworamo.pdf
    • http://www.lpcmath.com/uploads/1/3/0/2/130272390/5b60c675b4.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_off00006a17.bin
4479906e7e33e9a1e3147de9f822e0f44a5360629715058cecc60ed74ab0a7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A17 8472 bytes

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