Malicious PDF — malware analysis report

Static analysis result for SHA-256 585880455203eadc…

MALICIOUS

PDF

90.3 KB Created: 2021-03-29 15:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73a1755b24ba37e7e4c8590ea3e81aac SHA-1: d5c9aff83fa0db1c7e1b554c5f0f11c52cf55b7e SHA-256: 585880455203eadc327d6044ec6242c8bc5ded68610018c7555700014d5fcef8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing operation. The document body, though obfuscated, appears to be a lure related to search queries, directing users to external URLs like https://vilenefex.ru/strik?utm_term=what+is+the+best+keyboard+with+weighted+keys.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://vilenefex.ru/strik?utm_term=what+is+the+best+keyboard+with+weighted+keys
    • http://disconto50.info/iomega_storcenter_ix4_200d_nas_server_manualsttqu.pdf
    • http://doordash.link/1752868126426uc.pdf
    • https://dibekepoxifepef.weebly.com/uploads/1/3/4/5/134587143/5ddfc2.pdf
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/dabopo_pawisevapikevek_jilipepurek.pdf
    • https://sirowatogiwu.weebly.com/uploads/1/3/2/8/132814809/9502550.pdf
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/5580b282a1.pdf
    • https://cdn.sqhk.co/buganixezu/jaQHhhs/bunibodikaxurixupebix.pdf
    • http://kompledom.com/mojivezazezs2egc.pdf
    • https://fodewifejala.weebly.com/uploads/1/3/4/4/134491976/wogog_kugojud_lujan.pdf
    • http://chestlune.online/medical_check_up_form_for_work_permit7yk2y.pdf
    • https://gedofulijul.weebly.com/uploads/1/3/0/7/130775434/c7bf295820704a4.pdf
    • https://cdn.sqhk.co/modonasuje/hIuljje/rixiwe.pdf
    • https://wopewajut.weebly.com/uploads/1/3/4/6/134664352/tipobu_vuzedanodax.pdf
    • https://cdn.sqhk.co/jesupasuzoku/Nifjfge/small_story_in_english_for_class_9.pdf
    • https://bafexobis.weebly.com/uploads/1/3/4/0/134041027/2964673.pdf
    • https://gilaniluju.weebly.com/uploads/1/3/5/3/135386901/4a4d7e2131dc1c0.pdf
    • https://biligimanud.weebly.com/uploads/1/3/1/4/131454089/6050106.pdf
    • http://kpupnov.pro/yamaha_timberwolf_250_specsrieaa.pdf
    • http://blancer.xyz/41193034000whua1.pdf
    • https://cdn.sqhk.co/torazanopuni/fQflgjk/winapuluxesif.pdf
    • https://cdn.sqhk.co/regavebike/jjvNXji/dosasivuxogizime.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9e9e1526-a6bc-4e60-b478-53caa6f61618/innova_3030rs_obd2_code_reader_review.pdf
    • https://uploads.strikinglycdn.com/files/ff4c872c-4bcd-4479-8964-4e135a8f7395/excel_sheet_wont_scroll_with_mouse.pdf
    • https://uploads.strikinglycdn.com/files/24d8fa56-d7a9-40a3-8b9e-047814d12f9c/56348211807.pdf
    • https://uploads.strikinglycdn.com/files/b923dba5-b1fd-4c28-99ea-15453408bdf8/mevelebelavus.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_off00012432.bin
da475b817c73393e423b8fc9ee47c3b6cf016fec9472d897c11a71b7589450d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 5468 bytes
font_01_sfnt_off000136e1.bin
0660333ebd1f36abc554426f7c9f093b6d906ce509523980cd0b185e9d75ebbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136E1 10736 bytes

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