Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadb7f7c1c5e535f…

MALICIOUS

PDF

41.3 KB Created: 2020-04-13 12:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b770815649fbbce6768a304f521eeac SHA-1: 2aa68eb006d810f0c0e090824718b6123a8c21d2 SHA-256: cadb7f7c1c5e535f4e0bb0355cabfb3027b3c871af67950d6c6ee89c63660fb7
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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The embedded URL and the numerous other extracted URLs suggest a link farm or redirection scheme designed to lead users to potentially malicious content. 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://betsysboutique.org/uploads/1/3/1/4/131453027/131453027.html#ibm+thread+and+monitor+dump+analyzer+for+java+technology
    • http://fascatipizza.com/uploads/1/3/1/3/131379999/rugujomurumuw_javeluk_detimuk.pdf
    • http://level8health.com/uploads/1/3/0/4/130478307/kesudipisafok.pdf
    • http://alanhubatka.com/uploads/1/3/0/5/130545565/6180799.pdf
    • http://noordinarygames.com/uploads/1/3/0/6/130621839/9354083.pdf
    • http://innercraft.org/uploads/1/3/0/9/130969166/468961387b1a64.pdf
    • http://our-little-home.com/uploads/1/3/0/3/130313784/3512138.pdf
    • http://shananigansonline.com/uploads/1/3/1/0/131071298/megilutovijos.pdf
    • http://miscarriageandmotherhood.com/uploads/1/3/0/9/130969570/zekadagekizoz.pdf
    • http://intuitivemedicalconsultant.com/uploads/1/3/0/8/130873795/zalederu.pdf
    • http://humphreysfreelancemedia.com/uploads/1/3/0/7/130775382/zikivikunavuwuzozu.pdf
    • http://jewelrybyvas.com/uploads/1/3/0/7/130739158/3700190.pdf
    • http://promobileroadrepair.com/uploads/1/3/0/2/130291358/7629454.pdf
    • http://differentlevel91.com/uploads/1/3/1/4/131453850/polilotobatik-zegofebusomepo-lakoju-xirapulupuxuka.pdf
    • http://themvcgroup.com/uploads/1/3/0/3/130379611/0595582ace5.pdf
    • http://promobiler
    • 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_off00007645.bin
05b084d7da1af4fd6311bfea23f181f632d876f0df0a65491b1a4f255f240b20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7645 9036 bytes

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