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)
MD5: d07d9eb0c9f5e773d3811cadee87488a SHA-1: 1ea726496b025800493a49f30e2931313a08325d SHA-256: 1b9fe37c71ea76da3104cb5f085fd483831fbbd8eb2eaff56c72b409ca768aea
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. These links likely lead to malicious content or are used for SEO poisoning to drive traffic to attacker-controlled sites. No scripts were extracted from this sample.

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
    • http://johnlilliman.com/uploads/1/3/0/5/130539759/4a74976b.pdf
    • http://kingdatabrand.com/uploads/1/3/0/2/130272592/razeno_puropazof_bipidovozadiduk.pdf
    • http://reiresearchgroup.com/uploads/1/3/0/5/130550782/6064926.pdf
    • http://curtissosa.com/uploads/1/3/0/6/130639953/bivagib_nosemutagiranuw_fotirerexesu_bebat.pdf
    • http://levipark.co.nz/uploads/1/3/0/9/130969853/5497384.pdf
    • http://bars4bitcoin.com/uploads/1/3/0/9/130969842/goxepin-bivifokikax-wobiwunaben.pdf
    • http://collaborativeleader.net/uploads/1/3/0/4/130488328/nutesan-kaneza-walodimobef-sozositux.pdf
    • http://boujiebsboutique.shop/uploads/1/3/0/7/130776067/403555.pdf
    • http://noreengoldberg.com/uploads/1/3/0/2/130271113/ba16bc8f33.pdf
    • http://donnasleadershipsolutions.com/uploads/1/3/1/3/131379026/a1399ad9e.pdf
    • http://nopressureapparel.net/uploads/1/3/1/1/131163955/882f0a2261251d.pdf
    • 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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

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

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