Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a63c830e3177dce…

MALICIOUS

PDF

86.7 KB Created: 2021-05-07 20:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9d7a7657422509c3b769ccbcf295c4cd SHA-1: 7b980220214a67d346b3f54d5c87c9a2c529d4a1 SHA-256: 1a63c830e3177dceb68f70fca312590cfd79ba42fdf3a8d932b0c3e7f57b6436
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the presence of external URIs and the link farm heuristic point towards the document's primary function being to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/strik?utm_term=what+is+the+meaning+of+the+minister%2527s+black+veil PDF link annotation
    • http://smallita.space/lord_of_the_flies_chapter_5_study_questions_and_answersxfg09.pdfIn PDF document text
    • http://doruguduku.iblogger.org/what_an_emergency_room_doctor_does.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/nifadikufukuregosotog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_5fd7582f09855.pdfIn PDF document text
    • http://aov.one/pandora_s_box_9d_manualwm5sr.pdfIn PDF document text
    • http://zenajok.medianewsonline.com/broadcasting_services_act_1992_australia.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/gexufivaxu.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/38785315755aevx7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419827/normal_5ff7dc36da61a.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/experience_certificate_sample_download.pdfIn PDF document text
    • http://glawerry.online/wilton_bake_it_better_oven_crisper_basketjmo3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423715/normal_60204be032e1e.pdfIn PDF document text
    • http://vinnipoh.fun/fotudejibeloxuziratatowin7qzh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461505/normal_60098cc636381.pdfIn PDF document text
    • http://help-violation.com/binding_traduzione_informaticah9jq6.pdfIn PDF document text
    • http://haifaiv.ru/nebazotimavizorusuuzs7t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fd9d7f9bb2cf.pdfIn PDF document text
    • http://wdd13.ru/how_many_calories_in_a_piece_of_long_john_silvers_fishzw41f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kusugafunerepo.rf.gd/natafekisifowuvonogi.pdfIn PDF document text
    • http://fexewon.rf.gd/pumilawokufojop.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_74555f47e43e4d44a6c128a486972ec6.pdf?index=trueIn PDF document text
    • http://kogavajel.epizy.com/25374144211.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_6cc586fdc34d49b48dac590e01516e47.pdf?index=trueIn 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_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 5604 bytes
SHA-256: 0cf2a9980f372623b58257f10339d6b21d9695e242b16c02d148f0e8b29ab45a
font_01_sfnt_off00012729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12729 11392 bytes
SHA-256: 83dde6f96183d7a3e9a55b9a73f441c8fcdfbd3c3778a4078de0caf20089beb5

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