Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aaefed0e8344823…

MALICIOUS

PDF

41.6 KB Created: 2020-04-10 03:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 08cd90fd4a10f9de8500d49d76851e49 SHA-1: d02542aca0e0ec7ef9dda82d813021d3e0f3524c SHA-256: 5aaefed0e8344823720dd3888487252e24283f4e6528eaf938bfa53d2db0d5fe
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, which is indicative of a link farm or SEO poisoning attack. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous external links suggests a potential for downloading further malicious content or redirecting users to malicious websites.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leukothea.de/uploads/1/3/1/3/131379290/131379290.html#george+foreman+indoor+outdoor+grill+recipes
    • http://mezzanineproductions.com/uploads/1/3/0/5/130539249/letoperopama.pdf
    • http://celerityrealestate.com/uploads/1/3/0/5/130543837/0bf822e8.pdf
    • http://houseofdiamondsphxdior.com/uploads/1/3/0/6/130604276/fafesudason.pdf
    • http://pinkcab.ca/uploads/1/3/0/2/130273894/lalomufenadar.pdf
    • http://mgclothingco.com/uploads/1/3/0/3/130323789/7863372.pdf
    • http://changingvisions.net/uploads/1/3/1/0/131070293/potorogomox.pdf
    • http://amadoshop.com/uploads/1/3/0/6/130639708/1912874.pdf
    • http://permanentmarks.net/uploads/1/3/1/4/131437107/mugukogobumeb.pdf
    • http://landsolutionsgroupllc.com/uploads/1/3/0/8/130813966/fowajupi.pdf
    • http://surgeryprocess.com/uploads/1/3/0/8/130874434/kovimikuloje-zikibobisudojin.pdf
    • http://doublecfarms.net/uploads/1/3/0/5/130588352/1200bd429d9ffb.pdf
    • http://htconsultingpanama.com/uploads/1/3/0/4/130488846/mokekikam_sorijisa_zesig_wapajapix.pdf
    • http://iammichaelwillis.com/uploads/1/3/1/3/131398145/e791da19a03cc4.pdf
    • http://pre-actnow.com/uploads/1/3/1/0/131070190/pakofuwamenalofevov.pdf
    • http://almobilenotary.net/uploads/1/3/0/5/130550716/742424.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_off0000719d.bin
6e959c557c8bcc588d1907c0afd0cc5aa5b4c7f84f8397cbe82cf55fa2508da7
pdf-font-stream PDF embedded font (sfnt) at offset 0x719D 7632 bytes
font_01_sfnt_off00008f8a.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8A 2616 bytes