Malicious PDF — malware analysis report

Static analysis result for SHA-256 7648eda4399b2a93…

MALICIOUS

PDF

37.7 KB Created: 2020-03-25 06:08:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cf8b392ea882d428f74b3faf7b7a8943 SHA-1: 35f87a77ec504462ca63aa9e4ff1b8485432fd72 SHA-256: 7648eda4399b2a9330b7c86f7d59735a354cc48def65a12fa8ac680966efa7d7
136 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to other PDF files, a technique often used for SEO manipulation or to host malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may also be intended to trick users into providing passwords for encrypted archives, a common tactic to bypass gateway security. While no scripts were directly extracted, the PDF structure and extensive link farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hbcphx.org/uploads/1/3/0/7/130740212/130740212.html#cuestionario+ensanut+2012+pdf
    • http://annaoneal.com/uploads/1/3/0/7/130739291/fodeludu_tujakorituja_pekifirusiv_jirikogom.pdf
    • http://statmedicaltranscribing.com/uploads/1/3/0/3/130324288/xipazewunerigozigi.pdf
    • http://gospelsupply.org/uploads/1/3/0/4/130488067/521102.pdf
    • http://turismotard.com/uploads/1/3/0/4/130489536/kalaligegugire-woxesapogan-junepikaboxuv-tusogadife.pdf
    • http://futsal-regensburg.de/uploads/1/3/0/5/130551202/4464942.pdf
    • http://strootmanfotografie.nl/uploads/1/3/0/5/130588658/xowuvo.pdf
    • http://kinelyon6.com/uploads/1/3/0/5/130540397/fewugazox.pdf
    • http://odilefazioni.com/uploads/1/3/0/3/130313054/zamijuxil-gomuto-jopeji-zapeju.pdf
    • http://lynsiesgallery.com/uploads/1/3/0/4/130435712/suzimudinafademofoz.pdf
    • http://www.plantpathsensing.com/uploads/1/3/0/8/130813108/1988652.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f85.bin
eb8cf970f7fbc00a6c6a3e60a1f2416a280371eb4fe4c509803b0d51b5f2ff70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F85 1888 bytes
font_01_sfnt_off00006827.bin
d1713991c50bec520c396ee2dedeae3bb4a92f032834715d2e454be2bb280257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6827 8812 bytes

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