Malicious PDF — malware analysis report

Static analysis result for SHA-256 158ec9c064e27b66…

MALICIOUS

PDF

42.0 KB Created: 2020-04-18 06:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 480e70ea743ea36bd81f714f30137bf9 SHA-1: 8a9646a335497e7592ee5b30028240c036e7aff4 SHA-256: 158ec9c064e27b66079567436697d1ccb7622cb9132ede7220f068715f634df5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to direct users to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings suggest a malicious document designed to lead users to external sites.

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://christinabeautyparlour.com/uploads/1/3/0/2/130273748/130273748.html#formeller+brief+muster
    • http://wholelivingfarm.com/uploads/1/3/1/4/131407592/goduderadop_lusojatavaze.pdf
    • http://yourcapecodhouse.com/uploads/1/3/1/3/131379033/6722249.pdf
    • http://magnoliaministriesandcounselingcenter.com/uploads/1/3/0/7/130775189/ronafomunex_mejiboz_gofipaja_zuxuvafi.pdf
    • http://chesterandoscar.com/uploads/1/3/0/9/130969751/zegufiwuw_woririruv.pdf
    • http://araldia.com/uploads/1/3/1/4/131406861/93431c405d51c1.pdf
    • http://zeropoverty.solutions/uploads/1/3/1/1/131163610/140033bd8f3c340.pdf
    • http://clearpathdetox.com/uploads/1/3/0/6/130604947/7913868.pdf
    • http://borrelloenterprises.com/uploads/1/3/0/2/130273573/ac0e7e4b175da7.pdf
    • http://napacountylac.com/uploads/1/3/0/2/130287537/759375.pdf
    • http://rifugiovallegrande.org/uploads/1/3/0/4/130488539/ca6ba5ab3481e29.pdf
    • http://whataboutsecondbreakfast.com/uploads/1/3/0/2/130271226/zuxokikuf.pdf
    • http://oladrug.com/uploads/1/3/1/4/131407183/lagujadeje.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_off00007a97.bin
56c4d34ec00c2dd59f4528eedc66e229983ec8ffa5abe79546da2578cfe585f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A97 8724 bytes

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