Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4b8169ba4a0058…

MALICIOUS

PDF

36.3 KB Created: 2020-04-06 12:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a8cece3dacab67adeb7548345ef0b26 SHA-1: 20b70c0f35698301159123213542e6fe002551a0 SHA-256: 6a4b8169ba4a0058fcea147968d4e79db21732f20f37a6e9d9d7eda3832a27c7
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. The embedded URLs likely serve as a lure to redirect users to potentially malicious content hosted on these external domains.

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://reputation-digitalisieren.info/uploads/1/3/0/2/130272484/130272484.html#possessive+adjectives+test+multiple+choice
    • http://letschangeourcity.org/uploads/1/3/0/3/130379361/latububur-gejepip-jawekex-xakirufiv.pdf
    • http://bloomfield-laser.com/uploads/1/3/0/8/130874633/8788682.pdf
    • http://buy-a-website.org/uploads/1/3/0/5/130588708/90423e70dc1.pdf
    • http://stillrockin.org/uploads/1/3/1/1/131163494/21146ec7.pdf
    • http://cstoredashboard.com/uploads/1/3/0/8/130873945/0b733517ecb8b1.pdf
    • http://sylvialeconsulting.com/uploads/1/3/0/8/130813829/f54c85f109.pdf
    • http://njusic.net/uploads/1/3/0/6/130620974/jazav.pdf
    • http://atcountryandgun.com/uploads/1/3/0/7/130775130/warikifenigodogo.pdf
    • http://ethericbodyjewellery.com/uploads/1/3/1/4/131452825/wisavupugabimabem.pdf
    • http://revivetheroxy.org/uploads/1/3/1/4/131407945/4536917.pdf
    • http://atlantarvindoorstorage.com/uploads/1/3/0/7/130740166/fepujezubujip.pdf
    • http://jimleasteam.com/uploads/1/3/0/4/130483345/rodedun.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_off000065c5.bin
ebb13b16437b4255d74524926bdfd558c24ef9672cd0f1710b547d6ec9ac1131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C5 7756 bytes

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