Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b10060143e6e7fa…

MALICIOUS

PDF

38.6 KB Created: 2020-06-15 00:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4baa78c1cc2cedbdbcae683bd2e627d6 SHA-1: 3af982caea0aea64753104d92552858618cb7f7f SHA-256: 0b10060143e6e7fa6880b60c6f2aabcca03e12f2770a9aa9001291b412521bf8
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains and are likely part of a link farm designed to distribute malware. The document body, though obfuscated, contains references to URLs that are also present in the extracted URL list. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links.

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://host59.carmichaelnl.com/uploads/1/3/0/7/130775772/130775772.html#2009+gmc+terrain+consumer+guide
    • http://just4funpartysupply.com/uploads/1/3/1/8/131856533/legizisa-latulodut-lirav.pdf
    • http://meredithreednyc.com/uploads/1/3/0/6/130620275/bidafofe.pdf
    • http://49.undesirable.us/uploads/1/3/0/2/130272281/13068baf034f.pdf
    • http://de.chevalier-finance.ch/uploads/1/3/0/5/130589316/jololaxipulivo_navagujovezolel_kesidokusix.pdf
    • http://ipmofwa.com/uploads/1/3/1/4/131453170/kuxid_mebuxunigimimu.pdf
    • http://claritycounselingassociates.com/uploads/1/3/0/6/130620384/aac3d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bezizupubiwa.files.wordpress.com/2020/06/setimukekabaxezudinigida.pdf
    • https://senuxubu.files.wordpress.com/2020/06/52363800374.pdf
    • https://taxoloxud.files.wordpress.com/2020/06/woxutodidalevajis.pdf
    • https://zivilufu.files.wordpress.com/2020/06/xavalafexuro.pdf
    • https://muzapakupuxo.files.wordpress.com/2020/06/tajikisopibolu.pdf
    • https://pamizuz.files.wordpress.com/2020/06/kavufifigujol.pdf
    • https://nekalojowaj.files.wordpress.com/2020/06/padajokelasekubavugegaxa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a3d.bin
074ab1c4f1e6aa1341b3874fe3168f006c4fb2f4a01dd870db954100e766ff03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3D 10668 bytes

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