Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b3e28466f92db5…

MALICIOUS

PDF

38.3 KB Created: 2020-06-16 19:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffcebd63d2d2433a917301d5bf73b8ed SHA-1: b80561953a12d9364aac8398d8da71d9b0466f29 SHA-256: 19b3e28466f92db5d82b51a22cf705032148e188970045f8e83f1038a3f9facc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, identified as a PDF link farm. The primary URL points to a page with a title related to 'baby swimming lessons', which is likely a lure to disguise the malicious intent. The numerous linked PDFs hosted on various domains suggest an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the structure and link farm heuristic strongly indicate a malicious document.

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://host161.carmichaelnl.com/uploads/1/3/2/6/132681625/132681625.html#baby+swimming+lessons+earlsfield
    • http://mail.fatherjim.com/uploads/1/3/0/8/130874629/50f821448a331c.pdf
    • http://otbanks.com/uploads/1/3/0/6/130604361/9b1cd3686c4823.pdf
    • http://bombdrive.com/uploads/1/3/0/8/130874470/1e1f876d26a.pdf
    • http://status-confirm.com/uploads/1/3/1/3/131379110/716012.pdf
    • http://ledariuselectronicportfolio.com/uploads/1/3/0/6/130604158/b53a573.pdf
    • http://parents.sprigeo.com/uploads/1/3/1/3/131379824/9763717.pdf
    • http://angeloakinsurance.net/uploads/1/3/1/4/131406153/542439.pdf
    • http://localcoffeeman.com/uploads/1/3/1/4/131406821/2777989.pdf
    • http://mail.browbeginnings.com/uploads/1/3/0/8/130815381/mofekud.pdf
    • http://pleasureislandcruises.com/uploads/1/3/0/2/130287457/3611340.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057ef.bin
834869f4eea59a157ff89c697fe3271b76107a9240e143e4394cf15c259443fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57EF 5320 bytes
font_01_sfnt_off000069f0.bin
dce4e69c00dd72df94480dc0addcfa75e49193e825184a74d8873cd8654dbb19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F0 10340 bytes

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