Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62d25e1d542490b…

MALICIOUS

PDF

44.0 KB Created: 2020-04-11 07:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25795e90427bff541a8da54c38495888 SHA-1: 77c0a3f4ec91ba4d5db04c339a34b917d4f17253 SHA-256: c62d25e1d542490b9c06446560802feee6774689a27deb7fcb48688125a14d9d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm. The document body, though heavily obfuscated, contains a URL that likely leads to a malicious site. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. The primary attack pattern involves luring the user to a compromised or malicious website.

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://74-123-72-249.mgwnet.com/uploads/1/3/1/3/131382536/131382536.html#jazz+history+syllabus
    • http://kaleyshorter.com/uploads/1/3/0/6/130621788/polevopokadif_xosewup_zaroradavesi_ruwigu.pdf
    • http://magnoliamiles.org/uploads/1/3/0/6/130621626/vobimidazagobunu.pdf
    • http://thestoryofalstresia.com/uploads/1/3/1/1/131163729/9005086.pdf
    • http://reduxcustoms.com/uploads/1/3/0/8/130874410/808941.pdf
    • http://braveandgentle.org/uploads/1/3/1/3/131380868/zorito_sijasakodokan_regubun.pdf
    • http://sassyarabia.com/uploads/1/3/0/7/130775137/bapoxiko_gefatexevome.pdf
    • http://6x6designbuild.com/uploads/1/3/0/5/130550789/tusokewugax-suzuzajivalezu-temojo.pdf
    • http://coldspringspoultry.com/uploads/1/3/1/4/131407011/kuzakojibefefi_kelukokota_nitogebuzisi.pdf
    • http://andoverhomeessentials.com/uploads/1/3/0/7/130775176/e810ec0135e.pdf
    • http://bluewaternavy.org/uploads/1/3/0/4/130476045/4934545.pdf
    • http://dreampicspixelart.com/uploads/1/3/0/7/130740045/3352185.pdf
    • http://majoreliteproperties.com/uploads/1/3/0/5/130588906/7268755.pdf
    • http://sscog31.com/uploads/1/3/0/2/130271240/fb6cecb69ac.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077c1.bin
5bbbdef07c77d93f9da7b346328154629ec3e14bf636df5332d7d2182fec52aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C1 8480 bytes
font_01_sfnt_off00009887.bin
41d5c9cb4d60b7530e3cfd93a78efd430fe179aa57a8296e74fb8a971da4b0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9887 2600 bytes

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