Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb6d44a8e36b114…

MALICIOUS

PDF

72.9 KB Created: 2020-06-07 21:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22d3073f579a332c8797869ac09d857b SHA-1: 0243c22124fe2a63621644ccdd3fe6de9f3c22ad SHA-256: 7fb6d44a8e36b114abb8a92ca69037f770953fc063cba24d55e139ce91465623
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, characteristic of a link farm designed to host or redirect to malicious content. The PDF_SEO_LINK_FARM heuristic specifically indicates a mass of external PDF links, suggesting an attempt to distribute malware or conduct phishing operations. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://fun2gotravel.voyagerwebsites.com/uploads/1/3/0/7/130740205/130740205.html#%25D8%25B5%25D9%2588%25D8%25B1+%25D8%25AC%25D9%2586%25D8%25B3%25D9%258A%25D8%25A9+%25D9%2584%25D8%25B3%25D9%2581%25D8%25A7%25D8%25AD+%25D8%25A7%25D9%2584%25D9%2585%25D8%25AD%25D8%25A7%25D8%25B1%25D9%2585+%25D8%25A7%25D9%2584%25D8%25B4%25D8%25A7%25D8%25B0
    • http://numaistapeloc.net/uploads/1/3/1/4/131483468/7143f.pdf
    • http://colectivopazybien.org/uploads/1/3/0/5/130540458/e97e60b.pdf
    • http://ns1.carasoul.com/uploads/1/3/0/2/130287229/vemopukabifuvapidoka.pdf
    • http://rainbowsandrainboots.org/uploads/1/3/1/4/131483209/zesixezimisek.pdf
    • http://action-photobooth.com/uploads/1/3/0/2/130289235/jegafusefazojud.pdf
    • http://kathrynmarsden.com/uploads/1/3/0/8/130813511/2121627.pdf
    • http://ryansilverthorne.com/uploads/1/3/1/4/131453330/61ea00876f8e.pdf
    • http://uneedadanielle.com/uploads/1/3/0/9/130969330/losuvulipem_bopoluni_kezebasapaxi.pdf
    • http://steimerroadproductions.com/uploads/1/3/0/6/130603825/guzojo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tegaledik.files.wordpress.com/2020/06/83899221719.pdf
    • https://losevinaz.files.wordpress.com/2020/06/vagupoli.pdf
    • https://vitorufefu.files.wordpress.com/2020/06/jukorutuwapekigepakeda.pdf
    • https://jexuxadu.files.wordpress.com/2020/06/meluna.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000c141.bin
7425be1051103ba3f88c2216c420f33bc7dcc5707bf17b4cd38a340382608024
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC141 33284 bytes
font_01_sfnt_off0000fa3e.bin
118f626dddaeda13cff102783c73888297263ed2c089a43df781fe0dea3cef4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 7856 bytes