Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c305acb51a41992…

MALICIOUS

PDF

73.1 KB Created: 2020-04-08 07:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9004d89dcd741fa04208f06546e1b544 SHA-1: 2db139eb03ea62938306bf6fc1acbf2d2eb2dc39 SHA-256: 6c305acb51a41992fba6cb27b47f12ca81e3262b22f73d5e15cfbc6d5ceee574
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains URLs that are also present in the extracted URL list. The primary purpose appears to be directing users to a network of websites, likely for malicious SEO or to serve further payloads. No scripts were extracted, but the PDF structure and link farm suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8934

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://myqualityvalue.com/uploads/1/3/0/7/130740387/130740387.html#como+hacer+diagrama+de+pastel+en+excel
    • http://artdiscoveryinmuseums.com/uploads/1/3/0/5/130588437/kodos_sixozow_guzorej_nisujixe.pdf
    • http://joyful-learning.net/uploads/1/3/0/7/130775820/mitebek.pdf
    • http://aryneffert.com/uploads/1/3/0/2/130272573/f94537ecca.pdf
    • http://thelittleschoolproject.com/uploads/1/3/1/4/131408340/jezefujodapimujopi.pdf
    • http://assistedlivinghousingoptions.com/uploads/1/3/0/4/130435772/dfc64b4f2d.pdf
    • http://linux.thai.net/projects/fonts-tlwg
    • http://www.thaitux.info
    • 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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0000d9ba.bin
3a49bb3de32bedaef0af21d6fac20a2416fc6cfc2782f723ef654bd4d4c44c77		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD9BA 20764 bytes
font_00_sfnt_off00006cf5.bin
3efaf27fad6f9d8b632eb0171439da74814ad302be07698948d509ed16f0ad17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF5 12924 bytes
font_01_sfnt_off00008aa6.bin
0519a16c2d06a29fea7d13141c43699dd7634d53651a4a185d024f966a7d03b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA6 12340 bytes
font_02_sfnt_off0000b1bc.bin
6653d64cefef439609de74f4b066404dc6fc53fc73e0586bdedb07e2c92df8f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BC 12292 bytes
font_04_sfnt_off0000fca5.bin
3ef0a0da3985a69c63f9d9084a8ae672325268e7224429a0d2116f8f7008b79b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 8560 bytes

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