Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9aba52ec116f5bd…

MALICIOUS

PDF

38.6 KB Created: 2020-03-14 12:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c64bd1863c03caa82c682a59d4725e56 SHA-1: aa9c70ea435b66d16d0e4cb49af50c9d98805fd5 SHA-256: f9aba52ec116f5bda560c4ef5f68a46f6fe3f0416922723d41ce04bdd9c84d18
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm, likely intended to manipulate search engine rankings or to serve as a distribution point for further malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

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://www.benlewisanimation.com/uploads/1/3/0/9/130969220/130969220.html#birthday+celebration+images+free
    • http://conversationsonthegreen.org/uploads/1/3/0/4/130476513/bofuma.pdf
    • http://lbadisasterrelief.com/uploads/1/3/0/6/130604319/bekofupalox.pdf
    • http://stockmi.com/uploads/1/3/0/5/130539109/jatuto-bumamasonuwife-bizoxi.pdf
    • http://northeastwildernesscompany.com/uploads/1/3/0/6/130639768/kukedeloze_pobuwugo_jinapote_gizazil.pdf
    • http://www.pooldeckmarketing.com/uploads/1/3/1/1/131164557/2db3c1c9ec5.pdf
    • http://rodzinne-apteki.pl/uploads/1/3/0/6/130604295/4354279.pdf
    • http://infernostraining.com/uploads/1/3/0/6/130621160/vujiz.pdf
    • http://kauaihousechurch.org/uploads/1/3/0/7/130740244/rudosudulizibo.pdf
    • http://myclarendonhills.com/uploads/1/3/0/7/130776575/2546708.pdf
    • http://testmiapp.com/uploads/1/3/1/0/131070001/2741829.pdf
    • http://rockwoodreadings.com/uploads/1/3/0/9/130969237/takukagi.pdf
    • http://www.rhspca.com/uploads/1/3/0/9/130969508/dede8.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_off00006ce0.bin
dc2582aa3c3e9df68d124dc9e827827c1a1c15d9499397000b98e5481c0bc997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE0 8436 bytes

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