Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b80e784c7d06a44…

MALICIOUS

PDF

90.6 KB Created: 2020-04-09 19:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 873c495c96c40cdfe4f718a8a121d244 SHA-1: ac6dc281bdb3a06e64dd115ae7b53f38e08d5951 SHA-256: 5b80e784c7d06a44a7033109ef0cfa12d7942640b073ff5d5f83db62d86da596
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted across various domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. No scripts were extracted, but the extensive use of external links suggests a watering hole or content distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://barrusmemorialrace.com/uploads/1/3/0/6/130620764/130620764.html#educational+depth+and+weight+definit
    • http://lancosmetics.com/uploads/1/3/0/6/130621135/dimevuseni-lebabefel-dupajogenaj.pdf
    • http://hearinglinked.com/uploads/1/3/0/6/130639222/4cdffbd1a2e9bd2.pdf
    • http://ppat100.com/uploads/1/3/0/6/130621845/xaduzugodododida.pdf
    • http://doggiestyles.net/uploads/1/3/0/7/130739011/nalozenotota.pdf
    • http://basskatmusic.com/uploads/1/3/0/8/130813055/08711bda.pdf
    • http://gienekeyeshomes.com/uploads/1/3/0/6/130604671/pojafixafovova.pdf
    • http://rawfeedingvictoria.com/uploads/1/3/1/4/131437785/jufudezuwepo.pdf
    • http://nicolemfraley.com/uploads/1/3/0/9/130969657/2514826.pdf
    • http://troymillerconstruction.com/uploads/1/3/1/3/131383743/rugufojamowaje.pdf
    • http://robynlyvonnecakes.com/uploads/1/3/0/4/130488616/gezuxizopop-dinewup-vizofusu-papafanilure.pdf
    • http://tormentasdeverano.com/uploads/1/3/0/9/130969965/kanubud_moxuripeneponig_worevifejasajur_limitediranudi.pdf
    • http://grandcanyonatitsbest.com/uploads/1/3/0/4/130476850/wuxagejulu.pdf
    • http://tedytravel.info/uploads/1/3/1/3/131382126/70c37.pdf
    • http://linux.thai.net/projects/fonts-tlwg
    • http://www.thaitux.info
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0001133c.bin
946a8968aa49a7175cea07a77ca871a5a00a9948e280e5382a8dc07c058349c9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1133C 26788 bytes
font_00_sfnt_off0000873f.bin
0e52db334418c80570a1d47f27229be315df9537ee3fd1749079e1fb8e4c12dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x873F 12780 bytes
font_01_sfnt_off0000a50a.bin
4232cde364cd16ff1d80cced2720cae718c0a12ab0fd28af02e478557d2be333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA50A 15168 bytes
font_02_sfnt_off0000d161.bin
b86e972964eb5376382936d2277513691d000650464645257131cdc0a9cce286		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 7024 bytes
font_03_sfnt_off0000e5fe.bin
74f5d38c93894fe3ea60b1bf3d9898d432056873c1e35c5062725b48531196fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 13868 bytes
font_05_sfnt_off00014463.bin
0b7775ea26e2c0829e526a05d48e9580671c824376cd1970a170c61055c9a73b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14463 8428 bytes

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