Malicious PDF — malware analysis report

Static analysis result for SHA-256 bebfb3812102c8f2…

MALICIOUS

PDF

39.7 KB Created: 2020-06-07 00:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c75c72baac9769b0770fef76b7d7840 SHA-1: 3ef15860d081023030324c50c297aca8565a46df SHA-256: bebfb3812102c8f200768c3d25149eb9ec62f3198ef98601281ca0a6aa039805
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, contains text that appears to be related to strategy plans and includes URLs. The primary intent seems to be directing users to a network of linked websites, likely for SEO manipulation or to host malicious content. No scripts were extracted, and the ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://15kyg.bpmtc.com/uploads/1/3/0/2/130271090/130271090.html#pr+strategy+plan+example
    • http://mdmulticultural.com/uploads/1/3/0/4/130488157/2780038.pdf
    • http://webdisk.mindfulnesstrainingtilburg.nl/uploads/1/3/0/2/130271114/4630267.pdf
    • http://tospublishing.com/uploads/1/3/0/3/130323675/3244c0edec60.pdf
    • https://rojejimij901227669.files.wordpress.com/2020/06/53451614641.pdf
    • https://duvisigu.files.wordpress.com/2020/06/3662717937.pdf
    • https://rekenakimo.files.wordpress.com/2020/06/63499601793.pdf
    • https://kozaxijewob.files.wordpress.com/2020/06/19145951809.pdf
    • https://pogunuji.files.wordpress.com/2020/06/71501022738.pdf
    • https://rekinirive.files.wordpress.com/2020/06/zalunen.pdf
    • https://judesugitu.files.wordpress.com/2020/06/45944432252.pdf
    • https://gigepopigep.files.wordpress.com/2020/06/35759918913.pdf
    • https://vikozapu259838642.files.wordpress.com/2020/06/kikavutogasirigoj.pdf
    • https://dexuzonuluw.files.wordpress.com/2020/06/sitalapolamotikomisazenu.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_off00006f71.bin
859991025e4b974d3f6ff33dc243d0bc4a23aabf9c63d1f4e2864f3eb1e4b0da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F71 10672 bytes

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