Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ae3d67ea0e4a8a…

MALICIOUS

PDF

48.4 KB Created: 2020-04-06 14:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c83f51dbf4bd77a63c4a0266772259fc SHA-1: d04af741fa456afd2974ff8f817a00457a7187ae SHA-256: 51ae3d67ea0e4a8a79b3eec4788d336fb519d80799cc9014ddcbdd8b4c8d80a3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains the title 'Como hacer un asador de ladrillo sencillo' and several URLs, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of potentially malicious websites.

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://nochedeciencias-charlotte.com/uploads/1/3/0/7/130776822/130776822.html#como+hacer+un+asador+de+ladrillo+sencillo
    • http://tillsnuts.com/uploads/1/3/1/4/131438478/6a2588.pdf
    • http://bdhowardjr.com/uploads/1/3/1/1/131163902/lewudomupenu-tesumulid-mojudi.pdf
    • http://toobusymomsbooks.com/uploads/1/3/0/4/130476581/4660648.pdf
    • http://surfinghomeschoolers.net/uploads/1/3/0/7/130775897/268b2c7bc2.pdf
    • http://iplarn.com/uploads/1/3/0/8/130814401/8c842f9cc30f.pdf
    • http://ndhomesinc.com/uploads/1/3/1/0/131069886/3277445.pdf
    • http://gamergoodz.com/uploads/1/3/1/4/131452883/66cc798a398.pdf
    • http://spiritedquest-equine.com/uploads/1/3/0/7/130738912/6198104.pdf
    • http://vancees.net/uploads/1/3/1/4/131437074/wediga.pdf
    • http://dymobilenotary.com/uploads/1/3/0/5/130588842/6707966.pdf
    • http://dignitasyouthwestern.com/uploads/1/3/0/6/130639634/fufezozag.pdf
    • http://scrunchiesbymags.com/uploads/1/3/0/8/130874544/46628a7720580bf.pdf
    • http://mudnbutter.com/uploads/1/3/0/4/130488288/levogetipalujisetoka.pdf
    • http://lighting-coupons.com/uploads/1/3/0/7/130740432/wijaluvedasinel-jewodo.pdf
    • http://ziplinemarket.com/uploads/1/3/0/6/130639417/remibezeleguledup.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ba9.bin
3d67d44d5d28070ed1468fb2459509bd12b327ec7978f3f734fe4b1abef54108		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA9 8708 bytes
font_01_sfnt_off0000ab89.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB89 1708 bytes

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