Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b96b3c4ddfc6086…

MALICIOUS

PDF

86.2 KB Created: 2021-04-24 04:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bf0c82f4e12bbdfa6699ccadc725306 SHA-1: e31c8a1885446effc07d81f50ca8591c7581f931 SHA-256: 4b96b3c4ddfc608652def643c3bd3c25b2b7487c01d253d14b400573fea5bc35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of external links and the heuristic firings suggest this document is designed to redirect users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://nipisod.ru/strik?utm_term=focusrite+scarlett+solo+studio+3rd+generation+review
    • https://dawasaga.weebly.com/uploads/1/3/0/9/130969366/faf865db1d9.pdf
    • https://cdn-cms.f-static.net/uploads/4416666/normal_6034d3034180a.pdf
    • http://presentinsta.site/92581560918oekgp.pdf
    • http://lnstagram-copyright-supports.com/guardianes_de_la_galaxia_2_descargardhy3a.pdf
    • http://luzofogobud.22web.org/pelagajavemomifudelupadaf.pdf
    • https://cdn-cms.f-static.net/uploads/4411503/normal_60241a60b0e26.pdf
    • http://stat-index-co.com/150047488025jdjf.pdf
    • http://matrixbicycles.com/aprender_ingles_conversacional_online_gratis_rapidodc4xm.pdf
    • https://cdn-cms.f-static.net/uploads/4479921/normal_605794385d319.pdf
    • https://lijokojojet.weebly.com/uploads/1/3/5/3/135333606/9352667.pdf
    • http://slimitalia.space/penisenelexalu8syvi.pdf
    • http://tomogorman.com/rigol_ds1054z_hack_20182r5o7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d85b1738-a471-4043-b59e-116b2bb794a3.filesusr.com/ugd/97927e_855d28586be74b9ab9967cf4ba42949f.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_6efbc3dc0a9f444e8ce3f100cd007404.pdf?index=true
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_9ac0d1c1200a4b49ae494690d7d6dc61.pdf?index=true
    • https://63c031ef-a76e-4574-b6c7-b683c5cdde0f.filesusr.com/ugd/3a5e7a_d6d86ec442e446bcb5c545a8593fd421.pdf?index=true
    • https://0c7b1e5d-10e9-4c66-9a64-57e6babc74f3.filesusr.com/ugd/6b59ba_3869a307fe5e4c6f83022307f4947aff.pdf?index=true
    • http://xojazexodiwosi.epizy.com/71207187041.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f973.bin
1dec0d1452bb6aa6701b31583488c71c6b2c367bc72495f3516ed4bfabd335cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 5380 bytes
font_01_sfnt_off00010be2.bin
60a6deb50f6d1d68cb003fc2235c4c56ef91ddbe2ff6ac8961914cdef4cfc236		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 11724 bytes
font_02_sfnt_off000133e6.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133E6 16060 bytes

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