Malicious PDF — malware analysis report

Static analysis result for SHA-256 625e62a01d25850d…

MALICIOUS

PDF

43.7 KB Created: 2020-03-21 14:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4369eb53f88fdc13089ce2484e10b1cb SHA-1: ead2aa61bf8b3976ba8cfc1f724dff087eb8e6bc SHA-256: 625e62a01d25850d3d63675b8a5ae4c7f65db545cd77b2ef86efcad560f8d91e
136 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, many of which point to other PDF files. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to host malicious content or distribute further malware. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://advance-it.net/uploads/1/3/0/7/130776646/130776646.html#como+hacer+curvas+de+nivel+de+google+earth+para+autocad+2018
    • http://www.banerdesigns.com/uploads/1/3/0/8/130814749/novivubanobakesoxoze.pdf
    • http://www.advancedenvironmentalgroup.com/uploads/1/3/0/7/130739583/misegamew.pdf
    • http://christinetschida.com/uploads/1/3/0/4/130483508/fajav.pdf
    • http://educatedontembrace.com/uploads/1/3/0/2/130270904/8703289.pdf
    • http://www.ejernd.com/uploads/1/3/0/6/130604207/tibexotitugatorujak.pdf
    • http://webmail.ayudaavivir.org.mx/uploads/1/3/0/5/130589386/xowetag.pdf
    • http://www.wdfilms.org/uploads/1/3/0/6/130622038/xipij.pdf
    • http://pondsandpuddlesphoto.com/uploads/1/3/0/6/130639822/b638a2.pdf
    • http://curlroanoke.org/uploads/1/3/0/5/130588482/gemowo.pdf
    • http://sophiaeportfolio.com/uploads/1/3/0/4/130488846/5261619.pdf
    • http://suppliesmn.com/uploads/1/3/0/7/130740072/wegafuzuzifasarubap.pdf
    • http://webdisk.hairfarmsalon.com/uploads/1/3/0/2/130273884/nubawin.pdf
    • http://www.wangyaofabric.com/uploads/1/3/0/8/130873790/4e49e8b53df.pdf
    • http://allrawmusic.com/uploads/1/3/0/6/130621819/b22ebb57a.pdf
    • http://victoryit.org/uploads/1/3/0/4/130436173/1773161.pdf
    • http://mta-sts.mail.thengolist.com/uploads/1/3/0/6/130605399/nafeme.pdf
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000766f.bin
4f2e33799ab2121308a2a23ef556bdd8f5bebb4b38e3af4c1b1acaeea127c69d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766F 8604 bytes
font_01_sfnt_off00009576.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9576 2652 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.