Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac05071b7690db6f…

MALICIOUS

PDF

36.9 KB Created: 2020-03-24 11:23:46 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d9174464bf7873a44dc97942c4856a3f SHA-1: 38eaa7e41bc80230b60b2d75fe3c08bb2b9b4ec4 SHA-256: ac05071b7690db6f9dac622919c0dc3157e82e0b84ba7a1a553769d8459b536d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The document body text appears to be obfuscated or corrupted, but the presence of URLs suggests a lure to external content. No scripts were extracted from this sample.

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://wylaskincare.net/uploads/1/3/0/6/130604263/130604263.html#sm+bus+controller+driver+dell+optiplex+990
    • http://hostmaster.wacg.info/uploads/1/3/0/7/130776875/rixuzenel.pdf
    • http://teamdoitagain.com/uploads/1/3/0/4/130479435/477b1e557e832f3.pdf
    • http://mitzimileskubota.com/uploads/1/3/0/4/130478009/saxupu_ferovopogukidop_kazenoz.pdf
    • http://www.radioanjuman.com/uploads/1/3/0/7/130739779/2517973.pdf
    • http://westcoaststarsbu.com/uploads/1/3/0/6/130621868/8dfee15348385.pdf
    • http://murrayparkcondos.com/uploads/1/3/0/5/130546294/metubovuzep.pdf
    • http://edwardecker.com/uploads/1/3/0/4/130488885/pejufigerapaw-gejuwipepi-butenit-gelipive.pdf
    • http://funetix.ca/uploads/1/3/0/9/130969944/9794864.pdf
    • http://snazzybazzy.com/uploads/1/3/0/8/130874426/431851.pdf
    • http://duitauto.com/uploads/1/3/0/2/130272231/c4dbd.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_off0000557a.bin
7b9723e270e5654d622a238a2760cca4b70a279febae32af620902f306e836d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x557A 6884 bytes
font_01_sfnt_off000070d9.bin
677e71428f97d697e1d37b94920902cc1f79d6c40420e53eae369df573da2ac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D9 16192 bytes

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