Malicious PDF — malware analysis report

Static analysis result for SHA-256 436a8fe5b22acc72…

MALICIOUS

PDF

81.3 KB Created: 2021-03-30 10:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5ce3a8d5c652f3e8bf9e463e6cc623d0 SHA-1: 59c72ac2d21973b415da6a59a5e0e4503add441f SHA-256: 436a8fe5b22acc7223a3b32e1a4d17d8ca197655e97cb213597f0a22d576104c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/wix?keyword=fundamentals+of+thermodynamics+9th+edition+moran PDF link annotation
    • http://mirror-x.org/rafarupobupezewucvob7.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/online_converter_dwg_to_free.pdfIn PDF document text
    • http://chaptejvxz.fun/null_s_brawl_stars_iossd7ah.pdfIn PDF document text
    • http://biomaniks.website/object_oriented_analysis_and_design_syllabus_anna_university_regulation_2017xrwy4.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/bacillus_subtilis_natto.pdfIn PDF document text
    • http://cccckkkkkdd.space/vizio_32_inch_tv_wall_mount56dx3.pdfIn PDF document text
    • http://fatunatet.getenjoyment.net/how_to_speak_english_fluently_in_interview.pdfIn PDF document text
    • http://talivur.22web.org/what_does_an_emergency_room_doctor_do.pdfIn 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/40256741-6d22-45c2-b239-00b200b0892d/tawitoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1caf3958-9fe6-4834-b5d2-a09c5ef08755/pasovilomoboneti.pdfIn PDF document text
    • http://butojoboxorak.epizy.com/90513594213.pdfIn PDF document text
    • http://dodugan.rf.gd/zifexunifojasare.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/probability_distribution_worked_examples.pdfIn PDF document text
    • http://vutogebufuz.myartsonline.com/meaning_of_search_engine_optimization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63131797-a236-4099-acd2-3738c9797d30/43321658954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f84dc51-f08f-4378-8dc1-95fea05e1d3a/9751770757.pdfIn PDF document text
    • http://mogexusa.rf.gd/jingle_bells_musical_form.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/buy_lucite_acrylic_sheet.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_de20b2f145a54b84a8f0bb516efe6f6c.pdf?index=trueIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_0ee79e3549624794a8dd296ba322f18c.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_38795e657b174770916d59705217510e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/wodovifimozapax.pdfIn PDF document text
    • http://muvelexadaw.epizy.com/basic_english_grammar_questions_and_answers.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_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 5472 bytes
SHA-256: f48ca6e63e39ea2d35894ee10c1f91d01d2ebbf286d89cad57095f4305c3b0b3
font_01_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 10520 bytes
SHA-256: 006a23a9460e6f9c129ccd5afbd0c801e55d831576d2d361e1b82b98cdc4f5ad

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