Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcab3ae5f41a3c8…

MALICIOUS

PDF

46.9 KB Created: 2020-04-05 07:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a81de57e861198edd437073205d0ac7f SHA-1: 58f003a630ade1daa1f82b4abf4f82400b30cef0 SHA-256: 8fcab3ae5f41a3c88b1e4bba69d6bce9fcf3702a2d24b78bb95697b9139a14cd
92 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 to various domains, a technique commonly used for SEO poisoning or to redirect users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this pattern, indicating a likely attempt to distribute malware or phishing content through a network of linked PDFs. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://teshuvah.international/uploads/1/3/1/4/131438571/131438571.html#ejercicios+letra+script+para+ni%C3%B1os
    • http://powdermillbusinesscenter.com/uploads/1/3/0/6/130621544/490ef13.pdf
    • http://designsbydarline.com/uploads/1/3/0/4/130476778/popus.pdf
    • http://clubxperienceclient.com/uploads/1/3/0/8/130874224/bevezuxomog.pdf
    • http://onecontactoffice.com/uploads/1/3/0/7/130775603/5725925.pdf
    • http://myguillermofloresuagro.net/uploads/1/3/0/5/130542755/vijupibegulararojira.pdf
    • http://ribbonspaperscissors.com/uploads/1/3/1/4/131438783/vodigizubopuwam-najuvoge-koxunaxed-geran.pdf
    • http://azusadoglovers.org/uploads/1/3/0/6/130621865/4648706.pdf
    • http://aircontrolexperts.com/uploads/1/3/0/7/130776263/zinizovufogetof-jelavepu.pdf
    • http://teqnifi.com/uploads/1/3/0/4/130490245/dozeloru_kariril_vaniwugazeza.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_off000074d4.bin
dd45e6177be9432767011e6e42bb24267f9b79fa831ab50d4bc5bc839ff5d0f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D4 9424 bytes
font_01_sfnt_off000096de.bin
6f5589cf1763d9b30124e401b8407e77d4f7b0da0f268c3843f690d2cc1178e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96DE 16168 bytes

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