Malicious PDF — malware analysis report

Static analysis result for SHA-256 72357d02766dd8e4…

MALICIOUS

PDF

72.9 KB Created: 2020-03-28 08:32:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a9d4ef3114564da532a9d44f7aaae871 SHA-1: 5b32209afc8fcf682d07737d56c3f832d5689ff6 SHA-256: 72357d02766dd8e43478b0f1146deb47e525c00b7325d646e4a050cfb2f64c0a
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating a link farm with 30 external PDF links, suggesting a spam or SEO manipulation tactic. The document body, though heavily obfuscated, contains URLs that are also listed in the extracted URLs section. The presence of numerous external links points towards an attempt to redirect users to potentially malicious or deceptive content hosted on various domains. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dubaidesignsprint.com/uploads/1/3/1/4/131438397/131438397.html#restade+fracciones+con+enteros
    • http://brightneurons.com/uploads/1/3/0/5/130588861/janumexu_jivuferesivona_jamurarisodimen.pdf
    • http://secauto.org/uploads/1/3/0/5/130589080/3d650b58ce7c.pdf
    • http://sanfrancisco-interactivehypnotherapy.com/uploads/1/3/0/5/130588693/1222520.pdf
    • http://foundermachine.org/uploads/1/3/0/4/130476974/a7aeed35defcd5.pdf
    • http://queenofthewaves.net/uploads/1/3/0/5/130588574/7d9e47e58bf4.pdf
    • http://neoho.net/uploads/1/3/0/2/130271080/gidumugavaxawome.pdf
    • http://tigerlilyyoga.com/uploads/1/3/0/8/130873908/mimukavidugena-wavam.pdf
    • http://hostmaster.veritasecology.com/uploads/1/3/0/6/130640107/9758137.pdf
    • http://aneeqarana.com/uploads/1/3/0/6/130621634/1467910.pdf
    • http://ecosanexcleaning.com/uploads/1/3/0/2/130289002/a5ebe4c66cf.pdf
    • http://www.klinedogs.com/uploads/1/3/0/6/130604269/vabuwamixakixi-dogonukewa-kenowonepuvete.pdf
    • http://agingathometech.com/uploads/1/3/0/5/130588796/6216561.pdf
    • http://spokanebasslessons.com/uploads/1/3/0/9/130969795/4551135.pdf
    • http://rvtrailertires.net/uploads/1/3/0/4/130488073/6975650.pdf
    • http://miriamsterzelblog.com/uploads/1/3/0/5/130541803/vemonopeso.pdf
    • http://lbichef.com/uploads/1/3/0/6/130621036/fikonuwivo.pdf
    • http://mse2opiodepidemic.com/uploads/1/3/0/6/130621451/tutudim-gusekegusoged-balagakixukuvof.pdf
    • http://asliceofwisdom.com/uploads/1/3/0/7/130739802/7182791.pdf
    • http://www.carolalvarez.com/uploads/1/3/0/5/130588564/fapewerov.pdf
    • http://heybereaufuels.com/uploads/1/3/0/3/130313410/zisoborewotawavipaz.pdf
    • http://epoxynoco.com/uploads/1/3/0/6/130639765/2c31cfb2d0a8f3.pdf
    • http://datalyx.co/uploads/1/3/0/7/130775554/48f28f1e.pdf
    • http://server65098.misscarols.com/uploads/1/3/0/5/130590139/f87f8bf81e23d.pdf
    • http://pastillacytotecenelsalvador.com/uploads/1/3/0/6/130639199/dusapok.pdf
    • http://rzlifecoach.com/uploads/1/3/0/7/130776734/71b5d.pdf
    • http://linux.thai.net/projects/fonts-tlwg
    • http://www.thaitux.info
    • 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://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078bf.bin
4d56fc43627fb6e4fa7ae6d2ef446da92d53e07487a29ba5eba79dd39df1ed76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BF 12488 bytes
font_01_sfnt_off00009540.bin
0e831f486b9a7287917987d24b3e5c020307e965a9401c009bd6a53b9824cfde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9540 12556 bytes
font_02_sfnt_off0000bd15.bin
bf9716f728c772ab866891e478d68dd14306e9b778694b522697624a369e23e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD15 10212 bytes
font_03_sfnt_off0000de78.bin
f806e912a1537d1a386184034b4afb081b9c995632b6fbc3d9d1e17d022b1112		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 19376 bytes
font_04_sfnt_off0000fe54.bin
67b6779f82af44e8ecada882a2064b0ca631765dba5109f74c2f6d5370f2c62f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 8224 bytes

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