Malicious PDF — malware analysis report

Static analysis result for SHA-256 1761b23b402c7d83…

MALICIOUS

PDF

44.7 KB Created: 2020-03-24 15:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 49a1b6a1acf7d2311718ea4124611063 SHA-1: d6651ece122ed1268648f1f194377e3dd45983f8 SHA-256: 1761b23b402c7d83a95bdde05c9c107f33df3c4adbf6eec3db6d114a9875a86d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or redirection scheme, likely intended to direct users to malicious content or phishing pages. 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://pridetoprison.com/uploads/1/3/1/0/131070894/131070894.html#como+hacer+conversiones+de+unidades+del+sistema+ingles
    • http://ntstuff.com/uploads/1/3/0/7/130776169/4256560.pdf
    • http://bmdecoratingltd.net/uploads/1/3/0/2/130289186/ddf2d47543.pdf
    • http://aalahmari.com/uploads/1/3/0/3/130313577/siwozujowiraza_koxasutoredepi_dodeko_gupaxak.pdf
    • http://arrested-jreubenlong.com/uploads/1/3/0/2/130270901/845980203ef4e.pdf
    • http://burlise.com/uploads/1/3/0/6/130604715/9c65632da099d09.pdf
    • http://nyc-distribution-film-festival.org/uploads/1/3/0/6/130621437/sugitavomov.pdf
    • http://nusdive.com/uploads/1/3/0/5/130539340/5598129.pdf
    • http://inkbirdcomms.com/uploads/1/3/0/3/130313249/nuwewofalarojoj-podedufe-kepuk.pdf
    • http://worldfamouslasagna.com/uploads/1/3/0/6/130604885/ab4eab6d5bef23.pdf
    • http://stevestiling.com/uploads/1/3/0/2/130272934/lobadodakumiralabape.pdf
    • http://qrapht.shoptvinternet.com/uploads/1/3/0/2/130288361/pixazaket_vafopewozuxida_tonelum.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000789f.bin
f0d4da97f4164491a0a4febab3b2506e83444c34350535f627bb7a9b4747b06a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x789F 9148 bytes
font_01_sfnt_off00009981.bin
cfb3357b20fb01955c1e4a0ed568c791e3a97db8f0fbaa18432a833eaa1d19da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9981 2828 bytes

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