Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b6da768a3faa76…

MALICIOUS

PDF

37.4 KB Created: 2020-04-07 09:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 7e562768626990a7ea4cadcccf75965e SHA-1: 9214ca90b6e349f17d6685bfaa58d4950f2defc7 SHA-256: 33b6da768a3faa76bcc79eb05c0ac8d50844bc6e264a827249fabd867cb1a679
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which appear to be part of a link farm. The primary purpose seems to be SEO manipulation or directing users to potentially malicious content hosted on these external sites. No scripts were extracted, and the document body is largely unreadable, so the rationale is based on the link farm heuristic and the presence of numerous unknown URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kyflowernseed.com/uploads/1/3/0/6/130621283/130621283.html#musica+para+flauta+dulce+faciles PDF link annotation
    • http://utilidrone.fr/uploads/1/3/0/3/130323535/e7f9e5d0e5689a5.pdfIn PDF document text
    • http://benlewisanimation.com/uploads/1/3/1/3/131380916/wogubine-jusakijagabozu-jitoferemi.pdfIn PDF document text
    • http://hoomanabarbell.com/uploads/1/3/0/6/130621205/joxutigu.pdfIn PDF document text
    • http://spectacularvintageevents.com/uploads/1/3/0/9/130969993/cbb7d06a6ee.pdfIn PDF document text
    • http://daytontaxresolution.com/uploads/1/3/1/4/131452952/larikutusodo_kopexunixufisaw.pdfIn PDF document text
    • http://happybotanistcan.com/uploads/1/3/0/4/130435791/3961030.pdfIn PDF document text
    • http://thinkmental.science/uploads/1/3/0/6/130621997/buwuxubumebame-tiwot-garibi-gipilapokawuko.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
🗂 Part of campaign: agicole-acces.com 11 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000541d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x541D 8172 bytes
SHA-256: ce31b9ef2e9ecf20b2fd3ceaa8bcedabaff45b641f0b6f63521c4a5d7d8668f6
font_01_sfnt_off0000721f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x721F 16080 bytes
SHA-256: 264da58494b94e4704bc59a91ed7188a2e0b9fc1fa50d69edef70f2621d1673f