Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7614993de1fca7d…

MALICIOUS

PDF

40.1 KB Created: 2020-03-25 14:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b36e88ae9e4f89bb7dd37d7a752b3a5 SHA-1: c43e929bae07bf846a2575eefd2dbb521a249c2b SHA-256: d7614993de1fca7d3bc04bab9daefe7565b07db31e0969bb9e21797a979fcd40
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, 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 document body, though partially corrupted, contains references to URLs that are part of this link farm. This suggests the PDF is designed to redirect users to potentially malicious content hosted on these external sites.

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://stokesed508webpage.com/uploads/1/3/1/1/131164393/131164393.html#dibujo+perspectiva+conica
    • http://joeldoodles.com/uploads/1/3/1/0/131070843/2092960.pdf
    • http://equineomegagold.net/uploads/1/3/0/6/130603769/2116135.pdf
    • http://theimagespot.com/uploads/1/3/0/4/130489909/jofegami.pdf
    • http://primalprop.com/uploads/1/3/1/1/131163632/15523a471.pdf
    • http://www.met-wilderwood.com/uploads/1/3/0/5/130588203/ca0dc08.pdf
    • http://www.masjidabuhuraira.org/uploads/1/3/0/2/130289400/vagezilo_minarusuvod_nevudutixe_bisuwusediloxev.pdf
    • http://yogavadhuta.com/uploads/1/3/0/7/130775832/rifezedufavu_pelelajidoz_gevixade.pdf
    • http://www.corbettbomb.com/uploads/1/3/0/3/130313088/rirepuxu.pdf
    • http://advance-it.net/uploads/1/3/0/5/130588744/f0007e8f4.pdf
    • http://www.mygodsmiles.net/uploads/1/3/0/3/130379504/ddd3b610c6e.pdf
    • http://8thdistrictlay.org/uploads/1/3/0/3/130323596/085fc389da1.pdf
    • http://connections-coaching.com/uploads/1/3/0/4/130476514/7661992.pdf
    • http://scarlettsmagicalcreations.com/uploads/1/3/0/6/130604467/bavoji.pdf
    • http://sprintboot.com/uploads/1/3/0/4/130488810/9396629.pdf
    • http://openstemlabs.com/uploads/1/3/0/3/130323100/a37b664ff55.pdf
    • http://alonsoquintanilla.com/uploads/1/3/0/5/130590666/gurevowaxefesaxofa.pdf
    • http://3udora.com/uploads/1/3/0/5/130589317/a6e055c01.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_off00006a88.bin
156ea78f5a999053a59d1e96636ad25f111c3c6aeef624defc9618c30ce60bb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A88 8280 bytes
font_01_sfnt_off000088a1.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A1 1708 bytes

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