Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e266fcfe5684bfa…

MALICIOUS

PDF

71.2 KB Created: 2020-03-08 06:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7ffd260b428f7806ca3189e5406eef12 SHA-1: 1e3a2aabbb26b1d31026b164a34db59d1215c92d SHA-256: 5e266fcfe5684bfa2db5beb2ea41c753e23390247f896fa4c11b79dd50f626da
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 are numerically or generically named, suggesting a link farm or SEO spam tactic. The document body, though partially obfuscated, contains Spanish text related to reducing PDF size and mentions wkhtmltopdf, indicating a potential lure to phishing or malware distribution sites. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://74-123-73-178.mgwnet.com/uploads/1/3/0/8/130873715/130873715.html#disminuir+el+peso+de+un+documento+pdf
    • http://www.fairlieschool.com/uploads/1/3/0/7/130738762/rivapojivekagor-dumururilefa.pdf
    • http://saeedalmuhairy.com/uploads/1/3/0/4/130477090/4427605.pdf
    • http://www.thejpuniversalstore.com/uploads/1/3/0/9/130969657/48ea3.pdf
    • http://www.elgonjuridischadvies.nl/uploads/1/3/0/2/130271094/3db47be2d30438.pdf
    • http://www.spellinsbee.com/uploads/1/3/0/2/130287817/vivuka_beburuxokomolil.pdf
    • http://nerdschwag.net/uploads/1/3/0/3/130323762/3441176.pdf
    • http://cvqualityroofinginc.com/uploads/1/3/0/5/130588573/vofolikezagorebaji.pdf
    • http://analucas.com/uploads/1/3/0/7/130775361/wodamojisapup-kofukogufenu-xikedelax-jipezezejat.pdf
    • http://npnbuyer.net/uploads/1/3/0/5/130588499/rininonixikugimadu.pdf
    • http://mail.santiagoband.com/uploads/1/3/0/7/130775260/rojut.pdf
    • http://integradesigninc.com/uploads/1/3/0/9/130968921/1667631.pdf
    • http://linux.thai.net/projects/fonts-tlwg
    • http://www.thaitux.info
    • 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
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b39.bin
7ae50203b5c9704fa89b7781d388a6f8d6bdd3cde6659b0ab737c983617e61e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B39 11024 bytes
font_01_sfnt_off0000840d.bin
e662da08a4b1ced7955348405cdfa68e67e8ac0bb001fe89973c531ebd4d0339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x840D 12124 bytes
font_02_sfnt_off0000aa84.bin
41d5c9cb4d60b7530e3cfd93a78efd430fe179aa57a8296e74fb8a971da4b0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA84 2600 bytes
font_03_sfnt_off0000b384.bin
0ec690569684ab17203c76c44c4a1fc83328a8f82a4b54de015a3f198a6a5d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB384 10076 bytes
font_04_sfnt_off0000d4c1.bin
c6dbf45170bb03a3cd3dc61e3b94d13ec38f977758978f8c14afe77b89ec482c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 19180 bytes
font_05_sfnt_off0000f39e.bin
d3711f112def277c3a92632b657c868ee52629d5bc1550af367cba23b2ce2505		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 8896 bytes

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