Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9fe37c71ea76da…

MALICIOUS

PDF

46.9 KB Created: 2020-04-06 06:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: d07d9eb0c9f5e773d3811cadee87488a SHA-1: 1ea726496b025800493a49f30e2931313a08325d SHA-256: 1b9fe37c71ea76da3104cb5f085fd483831fbbd8eb2eaff56c72b409ca768aea
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, a common tactic for link farms or malware distribution. The ML classifier strongly flagged this PDF as malicious, and the heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a malicious intent to redirect users. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://snowballmushroomsproduceinc.com/uploads/1/3/0/7/130739060/130739060.html#un+ejemplo+real+del+derecho+mercantil PDF link annotation
    • http://johnlilliman.com/uploads/1/3/0/5/130539759/4a74976b.pdfIn PDF document text
    • http://kingdatabrand.com/uploads/1/3/0/2/130272592/razeno_puropazof_bipidovozadiduk.pdfIn PDF document text
    • http://reiresearchgroup.com/uploads/1/3/0/5/130550782/6064926.pdfIn PDF document text
    • http://curtissosa.com/uploads/1/3/0/6/130639953/bivagib_nosemutagiranuw_fotirerexesu_bebat.pdfIn PDF document text
    • http://levipark.co.nz/uploads/1/3/0/9/130969853/5497384.pdfIn PDF document text
    • http://bars4bitcoin.com/uploads/1/3/0/9/130969842/goxepin-bivifokikax-wobiwunaben.pdfIn PDF document text
    • http://collaborativeleader.net/uploads/1/3/0/4/130488328/nutesan-kaneza-walodimobef-sozositux.pdfIn PDF document text
    • http://boujiebsboutique.shop/uploads/1/3/0/7/130776067/403555.pdfIn PDF document text
    • http://noreengoldberg.com/uploads/1/3/0/2/130271113/ba16bc8f33.pdfIn PDF document text
    • http://donnasleadershipsolutions.com/uploads/1/3/1/3/131379026/a1399ad9e.pdfIn PDF document text
    • http://nopressureapparel.net/uploads/1/3/1/1/131163955/882f0a2261251d.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2C 8648 bytes
SHA-256: 342b848f7c24da792eb2b2936305913c5a3bd464bd9a22f8acefca980d8a11f7
font_01_sfnt_off00009985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9985 16064 bytes
SHA-256: fc0bcc9d08d908b8b1287d0ab2df4e3a5be78b1d1690d8efe3ff9d2c54ab5679