Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd73622513a2fbf…

MALICIOUS

PDF

35.1 KB Created: 2020-03-14 19:27:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e5f8c7f553a2de0d0c2dd64c97a33ce0 SHA-1: 0f9e718833258964671ea9862a163b3ff20b8f35 SHA-256: 8dd73622513a2fbf043b72108f9501c5fce5b4831e7fc1671674b71f7fde5f03
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files, a technique often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect 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://arcadiagardensllclandscapinganddesign.com/uploads/1/3/0/6/130639766/130639766.html#cells+and+their+organelles+worksheet
    • http://longboyulechengbeiyongwang.f18.ebkf.org/uploads/1/3/0/5/130590700/150914.pdf
    • http://amychurmt.com/uploads/1/3/0/7/130739029/7553346.pdf
    • http://michaelsinatra.nyc/uploads/1/3/0/5/130551597/631e33fd56ad980.pdf
    • http://www.cwintech.net/uploads/1/3/0/5/130551015/viladezak-lotisomivatu.pdf
    • http://middletonlumbercompany.com/uploads/1/3/0/5/130590432/tezufatusof-venimenirori-lowar-maxagobemile.pdf
    • http://thecontemporarycannabis.com/uploads/1/3/0/3/130323984/maxobigolupomi-bobefotejidena-sites-vesugiponejof.pdf
    • http://cyber-plus.net/uploads/1/3/0/3/130324420/4714756.pdf
    • http://www.casiscdc.com/uploads/1/3/0/3/130313002/bibakola.pdf
    • http://ozervisioncare.net/uploads/1/3/0/7/130739218/rozawerewanaxaxu.pdf
    • http://southafricanmedium.com/uploads/1/3/1/1/131164004/5943140.pdf
    • http://mikeflattdesign.com/uploads/1/3/0/4/130476978/xazuzematevajitavub.pdf
    • http://www.flyingfishnanaimo.ca/uploads/1/3/0/2/130287371/ae4b000.pdf
    • http://www.clfiteart.com/uploads/1/3/0/8/130814921/gupudixevavadijigew.pdf
    • http://www.agmetalworx.com/uploads/1/3/0/5/130550968/xirapawuti-bepejiwozixek-jimasolul.pdf
    • http://www.herculessubmersibles.com/uploads/1/3/0/6/130620529/3842160.pdf
    • http://cissphq.com/uploads/1/3/0/7/130740218/kuwatavakunazorif.pdf
    • http://www.countryside-creations.com/uploads/1/3/1/1/131164136/lofiwodev.pdf
    • http://aggint.band/uploads/1/3/0/5/130546290/69b88d5e.pdf
    • http://josephrizzophd.com/uploads/1/3/0/6/130604327/vukugejubem.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062c6.bin
9babb3d69414847f336fbc3a29aa9457ced37bd970b93d1cade4a8e774b1779f
pdf-font-stream PDF embedded font (sfnt) at offset 0x62C6 7140 bytes