Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ef37e141500d5b…

MALICIOUS

PDF

101.6 KB Created: 2020-04-15 17:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0820c474e351cda4bc531ff7e1230d09 SHA-1: 64dee4df5ca248af74ee00e042a654f0b43f7060 SHA-256: 58ef37e141500d5bc9b9880d716db277296c4d07a364aedfa3b3bfddca13f13c
94 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing a high volume of external links pointing to various domains. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to click these links, which likely lead to phishing pages or further malware downloads. No scripts were extracted from this sample, limiting the analysis of direct execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7600

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://moodlabnewlife.nl/uploads/1/3/0/2/130272278/130272278.html#bootstrap+glyphicons+file
    • http://lawyersforveteransfirstresponders.com/uploads/1/3/1/6/131636777/jefamutiwu_texina.pdf
    • http://allanboakmusic.com/uploads/1/3/0/7/130739393/melabiwogetote.pdf
    • http://ryanita-wedding.com/uploads/1/3/0/6/130604693/zadakog-xofiduwuwego.pdf
    • http://forge-x.media/uploads/1/3/1/3/131381712/nisal_vefumepofede_feledol.pdf
    • http://tgiiihealthcaresolutions.com/uploads/1/3/0/5/130541904/nesaxejubemogil_kapusob_novojedo.pdf
    • http://gwcbristowwhps.org/uploads/1/3/0/9/130969829/welovumogorajogojape.pdf
    • http://diaetguru.net/uploads/1/3/1/4/131407846/99c363bc35.pdf
    • http://equipro.org/uploads/1/3/0/8/130813514/foxuxeli.pdf
    • http://az60industrial.com/uploads/1/3/0/3/130313470/ef2214009c505d.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 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000661f.bin
b8554ac0c72d8150f6b23f744f0135577a0514865791f2487a052171edeff7cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661F 6700 bytes
font_01_sfnt_off000076a7.bin
de6aacb5a55f55b98bf3ae384f96a51051c900e5a59c241f5198d539ce1a3af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A7 6168 bytes
font_02_sfnt_off00008642.bin
120c041e256d3b1ba13e14b2429aee7a16682c0778ff980f67267f404c8ffb76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8642 26912 bytes
font_03_sfnt_off0000b50a.bin
68739f58a7426e3f11e1829dea725e97beb14b9181375ee2d78ab54fb277e0d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB50A 10780 bytes
font_04_sfnt_off0000c901.bin
f0cb73bdc4db953144871342ea51787cb0c35fc8addd09c7b116659192ccabfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 5424 bytes
font_05_sfnt_off0000df31.bin
0a0abf27f4cafb16d61c57d0857d1aca32e25fc793408913ecb4bcaf494a65e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 22376 bytes
font_06_sfnt_off00012916.bin
7568257b8b317d9e1dc79cff546db344d097ef4a1832d95d85d1f3c88a2d2cb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12916 1532 bytes
font_07_sfnt_off000130f2.bin
d561cbcfab771fcd7defc2fb5e0712e232569f17a4fc67844f539fe78c4b8e3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 9608 bytes
font_08_sfnt_off000147ba.bin
fef413806afcd0aeded1e1a03de24145028b0ba47fc181577311aa9ae61acf53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147BA 16744 bytes
font_09_sfnt_off00015f2c.bin
133548d511a2d399d6f5d8f8bdb2d39344c07f30182c4759e870e72c41cbb6ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2C 16020 bytes

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