Malicious PDF — malware analysis report

Static analysis result for SHA-256 0109d9644f030004…

MALICIOUS

PDF

36.5 KB Created: 2020-03-07 17:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 499fac3b1bb8dcc40ec18c66dab33c5c SHA-1: b0f7bbb73b1cd2fde930871faf0f39313639f5fc SHA-256: 0109d9644f0300049d5b2f213fa84a88be6231d0f12c5ceabe46142d7c661216
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body, though heavily obfuscated, contains URLs that are consistent with this attack pattern.

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://0jeyt.slpny.com/uploads/1/3/0/4/130477533/130477533.html#adjective+endings+german+test
    • http://www.mealsbymeghan.com/uploads/1/3/0/5/130588296/mozagipexizabexu.pdf
    • http://popuppads.com/uploads/1/3/0/8/130813362/b21e1d5f95ba.pdf
    • http://belgiumil.us/uploads/1/3/0/6/130621501/zuriwax.pdf
    • http://nexgenbioscience.com/uploads/1/3/0/7/130776810/a572cb56b403645.pdf
    • http://thisfuckingsucks.net/uploads/1/3/0/2/130289723/losesigozuga_kelifi_sojuratijude_fejisulakikor.pdf
    • http://autobahnregistry.com/uploads/1/3/0/6/130605166/nogaxelefixokizeme.pdf
    • http://neilcopes.com/uploads/1/3/0/6/130604562/jesibedako.pdf
    • http://souvenirhk.com/uploads/1/3/0/7/130775222/buwoma-podazasovez-zuwexiv.pdf
    • http://0fflce365.live/uploads/1/3/0/3/130324011/pikunemigod_nedojoxeziwa.pdf
    • http://myacrepairorlando.com/uploads/1/3/0/6/130621300/tepiwor.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_off00006537.bin
2453328d77891841acac2dbe06af5e9faf2a8abecc0d68fe14d354e96b3708ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6537 8044 bytes

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