Malicious PDF — malware analysis report

Static analysis result for SHA-256 a999bf280d3463ca…

MALICIOUS

PDF

100.3 KB Created: 2021-04-18 22:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f72254dd77a9ddfe48835530f7db5499 SHA-1: dfc95864278c16e38930399d889ae0a717374d4f SHA-256: a999bf280d3463ca1a5294bfcbac6ed2bbcc60e0a917a36711cc942df01b8a69
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of the URL 'https://resalured.ru/strik?utm_term=night+shift+jobs+houston' suggests a lure related to job opportunities, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://resalured.ru/strik?utm_term=night+shift+jobs+houston PDF link annotation
    • https://cdn.sqhk.co/jivazufevi/1hgjesp/mufogazupodibivatikubijo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446045/normal_5fcd981411fd5.pdfIn PDF document text
    • http://navalny.design/5536659148h8939.pdfIn PDF document text
    • https://cdn.sqhk.co/gegatuzikat/jcgcijG/penibevel.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/Viigjgx/call_of_pripyat_zone_survival_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_602f95e3c9a22.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/e37kKjd/dragon_world_hack_game_download.pdfIn PDF document text
    • http://3bki.ru/349489820203up1c.pdfIn PDF document text
    • http://jovanilimifolom.22web.org/babamakowudirabasekuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463277/normal_5fff66e6d83a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_601081aaad987.pdfIn PDF document text
    • https://cdn.haleymarketing.com/templates/62660/logos/logo.pngIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5440e56b-60fb-4953-9750-5f655f1352e2/74642489623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c4e4ec1-408f-4064-8c2a-1bff218160fc/lazarillo_de_tormes_tratado_2_english.pdfIn PDF document text
    • http://juwijez.rf.gd/61345229060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7baecc8-3a3f-477d-8446-781572686063/65025245454.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/what_is_arbys_gyro_meat_made_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97312998-2b4d-40b3-9224-6134dfaa448e/what_the_best_scripting_language_to_learn.pdfIn PDF document text
    • http://gawowupakifofe.rf.gd/problem_and_solution_text_structure_slideshare.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/51214942686.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/britain_s_got_talent_app_apk.pdfIn PDF document text
    • http://ruxurosagogaru.epizy.com/61574164919.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/defobawul.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3E 4876 bytes
SHA-256: 01abb58b6ffb0e94a3dd3f018b8c40b29b266401fbcb58a8ff9c7b84395e285b
font_01_sfnt_off00015aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEC 12260 bytes
SHA-256: 6156d45dfe8b2ac6178ab523239d547f8281d09bf0baaa2feb845d7619bdf989

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