Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b984d48b1586bb…

MALICIOUS

PDF

34.6 KB Created: 2020-03-21 15:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a42a8201f9e9be2fd1d57ef8d6619594 SHA-1: 55ab0c93ceda69e22beb053eb03717bd3596856e SHA-256: 16b984d48b1586bb3d4dc4fb7e5687bffffcb6b41d9c2c72e24a7f12617c9b25
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external URLs, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains references to these URLs, suggesting a coordinated effort to direct users to potentially harmful websites. No scripts were extracted from this sample, but the sheer volume of external links points towards a link farm or SEO poisoning attack.

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://bartolomeilaw.com/uploads/1/3/0/5/130544078/130544078.html#dibujos+de+animales+salvajes+para+colorear+e+imprimir
    • http://landscaperscolumbiasc.com/uploads/1/3/0/2/130271142/mexavegavare.pdf
    • http://www.hamptonscomputershb.com/uploads/1/3/0/7/130776319/liwopituvegumi.pdf
    • http://crispandsmooth.com/uploads/1/3/0/5/130551708/8bca7e.pdf
    • http://ketocoacher.com/uploads/1/3/0/5/130551176/gotuxosijo.pdf
    • http://aeprilsarcana.com/uploads/1/3/0/6/130604979/wovig.pdf
    • http://www.urbanninjagear.com/uploads/1/3/0/4/130491850/b1960bdb01.pdf
    • http://powerofproton3.website/uploads/1/3/0/6/130639396/530a0024.pdf
    • http://studiouswebdesign.com/uploads/1/3/1/0/131070771/dunexulodazobak.pdf
    • http://el034.elrepco.com/uploads/1/3/0/4/130478484/8758997.pdf
    • http://easy-rentals.net/uploads/1/3/0/6/130621461/eb5e826f63.pdf
    • http://edemtec.com/uploads/1/3/0/7/130775659/87d44.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_off000060d2.bin
a79a2c594c92118bb29d6f7ea9cbfcabea3815eebc47f28dc861a373c03fe7ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D2 8024 bytes

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