Malicious PDF — malware analysis report

Static analysis result for SHA-256 f676cc998529eaf7…

MALICIOUS

PDF

82.7 KB Created: 2021-03-20 17:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5be0af911587b2e20fec05cf3c70abf SHA-1: 90995852cfc59aa068433513b67a4ec6643e6b78 SHA-256: f676cc998529eaf709d300ff6baeb8fe8ddcd22ec563256efd44c71527bee3e2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or spamming campaign. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The document body, though heavily obfuscated, contains references to movie songs, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=anna+thangi+movie+songs
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5ff54f805b798.pdf
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5fd929c9479d0.pdf
    • https://cdn-cms.f-static.net/uploads/4377388/normal_604d027fe65dc.pdf
    • https://cdn.sqhk.co/numovasovev/haghehi/find_my_phone_app.pdf
    • https://xibigulekin.weebly.com/uploads/1/3/0/9/130968960/sezodevonod.pdf
    • https://cdn.sqhk.co/videgogaf/iYifNid/15771916180.pdf
    • https://rigaxufoze.weebly.com/uploads/1/3/4/3/134386371/fudilazitira.pdf
    • https://zukaxopukij.weebly.com/uploads/1/3/1/1/131164552/4761f9e.pdf
    • http://good-production18.site/mcdonalds_e_learning_app_for_maharashtra_state_boardtzkbo.pdf
    • http://rankingcoach-seo.com/vevilakodiluwo4zb1m.pdf
    • https://cdn.sqhk.co/pejinijew/iievge0/4_do_to_do_list_task_manager.pdf
    • https://cdn.sqhk.co/fovekuleru/ijhiIjd/activex_control_for_internet_explorer_11.pdf
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/98be6c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_f9e4f9f3e5ce45d18ebdfb763ec4a4d8.pdf?index=true
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_cbc08298a8a94a33b5e871bdd10c12d5.pdf?index=true
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_d28814a90eb7494eb9afda5bf2dfd775.pdf?index=true
    • https://s3.amazonaws.com/lorerexeg/lake_tahoe_snow_report_november_2018.pdf
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_b02618ceddc24bee916f91422c21f4f2.pdf?index=true
    • https://s3.amazonaws.com/wuvepilamamuse/26000066866.pdf
    • https://s3.amazonaws.com/sefiwegegagu/kikekekanujo.pdf
    • https://s3.amazonaws.com/kakekojezutok/lusokaxakuxijofokodita.pdf
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_28b954befcd647eaa2de4b65df834b6d.pdf?index=true
    • https://s3.amazonaws.com/tiniruru/create_sheet_music_free_software.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010554.bin
2305dac7d60cf4a93249b350b42893885a19d55edc46f9eec1b769971677bbe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 5020 bytes
font_01_sfnt_off00011652.bin
f053006b4c1fc4ca95cdf3f0a8da214391786b07dc150b994cdd4cea01faa4ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 11432 bytes

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