Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f72b143ed56a60…

MALICIOUS

PDF

43.7 KB Created: 2020-05-22 06:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4374fcc8b0c28449f76d0d50db107b0 SHA-1: b890d68bbfe7bf61844fc3e1caa037462e68e80c SHA-256: e2f72b143ed56a6024e6ec25a106582685176d00b2bee96803b20600b5fae450
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, a technique commonly used for SEO manipulation or to distribute further malicious content. The 'PDF_SEO_LINK_FARM' heuristic firing confirms this behavior. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of outbound links to potentially untrusted domains suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://haiwangxingxianshangyuledaili.br3h.com/uploads/1/3/0/7/130738591/130738591.html#diff%25C3%25A9rence+gendarmerie+mobile+et+d%25C3%25A9partementale
    • http://cjohanssonart.com/uploads/1/3/0/4/130436190/mitejozobupowej-detapegabeje-wetuvojujubeman.pdf
    • http://institutgenou.com/uploads/1/3/0/7/130738706/7186605.pdf
    • http://white-cake.com/uploads/1/3/1/4/131438073/mipegu-kipamejomisebo-bifav.pdf
    • http://jmcounselingservices.com/uploads/1/3/1/6/131606253/kobakunulatu_wemakal.pdf
    • http://hyderabadeyecentre.com/uploads/1/3/1/4/131438432/1188839.pdf
    • http://predierilegal.com/uploads/1/3/0/6/130621053/5054162.pdf
    • http://katakanyamoses.com/uploads/1/3/0/5/130551704/80dbb.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_off00007572.bin
b304c2924da9b0d79e544c8096e0f41863a23394419a962402af4873ff37ebbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7572 14644 bytes

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