Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c22e043882c2bb…

MALICIOUS

PDF

90.0 KB Created: 2021-05-13 20:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87106e746298905bad8f4a9fcd8f9ec4 SHA-1: 87d10e93c779b47f85838e8c7b9b55a7df408a96 SHA-256: 45c22e043882c2bb0ee8af949e6d74e8855a3384c07a3939100b40009ace592d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('resalured.ru') that is likely used for phishing or malware distribution. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on disposable hosting, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=my+at%2526t+u+verse+wifi+not+working
    • http://lolkek.xyz/unspoken_feelings_of_a_gentleman_2krld1.pdf
    • http://wuzagabi.22web.org/mamabir.pdf
    • http://fusubakitakudup.66ghz.com/24760142960.pdf
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5fd1458831692.pdf
    • http://kkkirrreeee.space/74170940739wpihe.pdf
    • https://cdn-cms.f-static.net/uploads/4380219/normal_60403245d699e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_d219ada066214a6082167d0f8c7ef456.pdf?index=true
    • https://uploads.strikinglycdn.com/files/535c1caa-4c3b-4cc7-93c0-b145054358e5/mivemupoxumageta.pdf
    • http://pugunexipidil.rf.gd/tm-ac1900_factory_reset.pdf
    • https://s3.amazonaws.com/padosumifubobo/14th_finance_commission_guidelines_in_gujarati_language.pdf
    • https://uploads.strikinglycdn.com/files/52d1def2-e186-49d1-8770-9e5b5d996fc3/fezifad.pdf
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_a16619d9274a44c1aee289ba2a2054f7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/35729fbc-d9eb-4ae8-8566-85ad4ea78ea1/3844379056.pdf
    • https://s3.amazonaws.com/tubupejevomo/41980357421.pdf
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_0d01698f0ee5460399edff8a55af7b0c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b5d3d7c4-1df4-4d83-9d41-4ecd45d5afa6/lunuduxututosezavik.pdf
    • https://s3.amazonaws.com/gimisorixosu/ar-15_scope_mount_with_iron_sights.pdf
    • http://lugelugadafutes.rf.gd/ge_hydrowave_wont_spin.pdf
    • https://e321b6f2-2a0a-4c58-8c60-26baf46d82f1.filesusr.com/ugd/14900c_a8e674ec620b4eb88ff499ba233cd674.pdf?index=true
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_af0c6d008d0d4c189765bf046a1d6771.pdf?index=true
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001012b.bin
f725b616a1add9e943c6eb4fb6e7c9f4993d2e6aee03ef0522a7e9ab2836f318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 2912 bytes
font_01_sfnt_off00010b86.bin
6aca53b7f74efff1c6cae3ce0caf97093c1160029be8921bf0d52e8f74d0b3d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 4480 bytes
font_02_sfnt_off00011ae6.bin
3d04217e991f4b22f2f8897bee95c14410037cb3132c491bf579d096d11a2e2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE6 11972 bytes
font_03_sfnt_off000143d5.bin
7c776e5eea023699f371194d12e6bf94cc07d0f218a2e329aa39d16e66640f7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143D5 16180 bytes

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