Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ab1eab23b0cd21…

MALICIOUS

PDF

75.4 KB Created: 2021-05-15 01:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 414dd00b5869a002c6922e18c48dd227 SHA-1: 6c4667e60c4950592a2c0c6ad70a0b11bf8bd15e SHA-256: 21ab1eab23b0cd2123885fb4dedb44abc20d5ad0cb52be0286a14370fc08421a
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'seumenha.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to reference 'Tecumseh engine 5.5 hp', suggesting a lure to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=tecumseh+engine+5.5+hp
    • https://static.s123-cdn-static.com/uploads/4450044/normal_5fce724eb34fa.pdf
    • http://lebepufu.mypressonline.com/data_warehouse_toolkit_2nd_edition.pdf
    • http://gonalotuturopil.mywebcommunity.org/importance_of_demographic_profile_in_research.pdf
    • http://wukazejuze.22web.org/fudexodetolixosuvugep.pdf
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5fe64c8abe294.pdf
    • https://static.s123-cdn-static.com/uploads/4383699/normal_5fcf5b4da5594.pdf
    • https://cdn-cms.f-static.net/uploads/4450721/normal_606384842e30f.pdf
    • http://rojibitakuvekuw.scienceontheweb.net/74687454724.pdf
    • http://mokuduvejevuz.scienceontheweb.net/xilidupavidojujugirozo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_1cfca269c954487f8a0dbddfbe2c61d8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3221352b-a2f4-496a-9b58-f0569b6d16df/what_were_womens_roles_in_society_before_the_1920s.pdf
    • http://tiluxusimutine.atwebpages.com/alter_ego_a2_plus_cahier_d_activits_corrige.pdf
    • https://9dd02728-8b0e-4c16-8a5b-31b14a6ec887.filesusr.com/ugd/d8c3ed_aba08847eac44b74afb992a32b573f7c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/88d44f55-e7ce-4dec-a493-f7091a28632b/best_tiger_quotes.pdf
    • http://jitawidavez.atwebpages.com/sociology_of_law_download.pdf
    • https://uploads.strikinglycdn.com/files/004f2875-e889-41ba-9266-01870749f0b1/nelifefelebadevujojinenaj.pdf
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_dbed147fdad84007af7a59efd4e36b0b.pdf?index=true
    • http://ninanupazazudad.rf.gd/engineering_guide_classic_gnome.pdf
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_90ff855d2bc04fe38183987df646522d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ba7e5421-f656-435e-a666-39b258e98bf9/how_would_you_measure_cm2.pdf
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_b48a686bd4e140b09cac2a6452eef925.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e824.bin
a5b7a8adeff02105f3f7ca072f793e67d6c561bc4b64a7ce8b726ad7b9250040		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 5116 bytes
font_01_sfnt_off0000f97d.bin
0c08a4c4a8d7298cc52cc97ca00f00af980eb682c724d4ee1269ebc437663063		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 11480 bytes

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