Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e4c7746cb89e89…

MALICIOUS

PDF

46.4 KB Created: 2020-04-05 14:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f25841a7da535fc918912d1732b7d12d SHA-1: d45f4d726fd3254abdecf3308dbd99e7618f8895 SHA-256: 63e4c7746cb89e89a9ef7fa7aafe765a4e3d1b082c1fb6394584f5244a05945c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or content distribution tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports a malicious intent. The document body itself is heavily obfuscated and contains embedded URLs, but the primary threat appears to be the redirection to external content.

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://marikacleaningservice.com/uploads/1/3/0/7/130738960/130738960.html#3+oraciones+conjunciones+copulativas
    • http://thegimpytraveler.com/uploads/1/3/0/7/130739769/zupefigen.pdf
    • http://aapae.org/uploads/1/3/0/5/130588384/3e4deebcf9ddb90.pdf
    • http://missionarymark.com/uploads/1/3/0/4/130488152/9630045.pdf
    • http://crenerds.com/uploads/1/3/0/6/130639085/maposatola_vapaj.pdf
    • http://trinitycastle.com/uploads/1/3/1/1/131164243/mipozusifuluwof_rovelodizel_tipudonokokebur.pdf
    • http://mediicepaks.com/uploads/1/3/0/6/130605291/rekimarel.pdf
    • http://mrcheeseexpress.com/uploads/1/3/0/6/130622022/nowutivubab.pdf
    • http://lymanandersonart.com/uploads/1/3/0/7/130776504/9117391.pdf
    • http://sampeterson.com/uploads/1/3/0/4/130436209/8440749.pdf
    • http://amksecurities.com/uploads/1/3/1/3/131398489/6cec380.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_off00008b69.bin
b5b54fe936c1a0dc19265810797da667391cd48efe04508fc6cb8d495b365a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B69 8784 bytes

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