Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a4f713b1bb6760…

MALICIOUS

PDF

38.5 KB Created: 2020-03-20 11:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b8878f46c780aeed3e3a69426bd8fed SHA-1: a8d59865fec848f206c6ef0c76f47ced3fd6874b SHA-256: 86a4f713b1bb676043afc43ce35ff01a331dfc9f7728c995e35c5c41b7e16b4b
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of numerous URLs suggests a link farm or redirection scheme. The primary intent appears to be directing users to external resources, likely for malicious purposes such as malware distribution or phishing.

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://murraywhiteley.com/uploads/1/3/0/6/130604566/130604566.html#canon+mp11dx+calculator+manual
    • http://risingstarcafe.net/uploads/1/3/0/6/130605314/tanalepafosurizezawu.pdf
    • http://education-mindset.ca/uploads/1/3/0/3/130323455/lelokin-jojagunovede-wunumonomegapox-migubapomejas.pdf
    • http://elliott-wright.com/uploads/1/3/0/2/130288986/fdbca8.pdf
    • http://teatrforte.pl/uploads/1/3/0/6/130605203/zegiluw_wesikasari_ragun_vizufiwux.pdf
    • http://lukevanbrabant.com/uploads/1/3/0/7/130739934/4504204.pdf
    • http://northmont.net/uploads/1/3/0/6/130604884/4a0f138cd49d.pdf
    • http://ringsking.biz/uploads/1/3/0/4/130476502/f6d4e40.pdf
    • http://lrjrhawks.info/uploads/1/3/0/5/130541211/5046776.pdf
    • http://complementarybuddhism.com/uploads/1/3/0/3/130379798/65a928ee0c96f24.pdf
    • http://atlshoebank.com/uploads/1/3/0/6/130620838/b4258e7.pdf
    • http://somersetfoodtrail.org/uploads/1/3/0/3/130313176/9362902.pdf
    • http://www.siamthaithaicuisineonline.com/uploads/1/3/0/7/130739454/fa2404ef027255c.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_off00006e92.bin
d4b0efe358907f780f54724e8b97921eae625f07059a48487bf7f0f6b4736804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E92 7836 bytes

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