Malicious PDF — malware analysis report

Static analysis result for SHA-256 526a94e96373d36a…

MALICIOUS

PDF

32.4 KB Created: 2020-04-02 10:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ec857dd801cd7fb25e85b6753db9273a SHA-1: 43673e3110aabcdb23463201e0c80201e1fa5407 SHA-256: 526a94e96373d36ab683bf4bdcac7ccdc57c21f027e96ffcff9dfe14ff59d55e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the URLs, suggesting a coordinated effort to redirect users to a large collection of linked PDFs. The primary goal appears to be SEO manipulation or the distribution of a large number of potentially malicious PDF documents.

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://joyofphysics.com/uploads/1/3/1/3/131380305/131380305.html#clasificacion+de+libros+de+biblioteca+escolar+primaria
    • http://heightsallhomeservice.com/uploads/1/3/0/6/130622049/89970888cb.pdf
    • http://drhsmusic.org/uploads/1/3/1/3/131379398/4927b500dfe2a3.pdf
    • http://moschner.us/uploads/1/3/0/5/130547112/dagadaselivavujewaze.pdf
    • http://shopminez.com/uploads/1/3/0/6/130621669/nugotadebin_tobib_zagazefafisur_zaponumelojij.pdf
    • http://rddevelopments.net/uploads/1/3/0/5/130551718/b05bd.pdf
    • http://atasindustries7.com/uploads/1/3/0/5/130588940/bf9124111e463d2.pdf
    • http://kamilslesinski.com/uploads/1/3/0/5/130552034/b7c1947c0cca.pdf
    • http://tuonglaitreem.com/uploads/1/3/1/0/131070590/naraxakowumet_pipaxa_lowimik_diradubul.pdf
    • http://kellyboyle.info/uploads/1/3/0/2/130291415/linubiw.pdf
    • http://specscoffee.com/uploads/1/3/0/8/130874490/e232e852e141.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_off000054af.bin
a2c63a1ff5db8c5f9c8f1c450d8a4500153892fee1acdb9436349983e91a938a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54AF 8056 bytes

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