Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7fc9464d715c55…

MALICIOUS

PDF

72.8 KB Created: 2021-06-01 04:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1fbe882c7ffdba96f34b49b005044065 SHA-1: 1f2975ff25b4cbf7ea47f1dd971558698a8e49e9 SHA-256: 1b7fc9464d715c5553db303538eec76fd7dab6b08d903dc7758aff837e9fb63a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggest this malicious intent. While no scripts were extracted, the presence of numerous URLs and the ML classifier's high confidence score support the classification as malicious, likely for SEO manipulation or to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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.
  • 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://cructi.ru/pbw?utm_term=exothermic+and+endothermic+reaction+practice+worksheet PDF link annotation
    • https://zurenigexozaxil.weebly.com/uploads/1/3/4/6/134606750/lepuwajaduna.pdfIn PDF document text
    • https://wadezirukabag.weebly.com/uploads/1/3/4/6/134668274/2143906.pdfIn PDF document text
    • https://niwitibu.weebly.com/uploads/1/3/1/6/131636677/626091.pdfIn PDF document text
    • https://vusowixaxepuw.weebly.com/uploads/1/3/1/3/131381533/7217cbca71fd5e5.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/xaraxufobele.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/1291708.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/zujedulagi-gipedilenag-gogok.pdfIn PDF document text
    • https://butavuzi.weebly.com/uploads/1/3/2/6/132682386/3be78.pdfIn PDF document text
    • https://nabizajeti.weebly.com/uploads/1/3/4/6/134640454/2082167.pdfIn PDF document text
    • https://kimidevi.weebly.com/uploads/1/3/4/0/134018720/zejaduxajinan.pdfIn PDF document text
    • https://dinoromakutaxe.weebly.com/uploads/1/3/4/4/134479472/4809452.pdfIn PDF document text
    • https://lazoseroli.weebly.com/uploads/1/3/5/3/135316949/bf486f5caa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144434226/how_to_build_egg_drop_project_with_toothpicks.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/mobile_app_development_interview_questions_and_answers.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144411627/81675001342.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/xirefipef.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/w/file/fetch/144440943/tixoxabowijebodagif.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/f/21969573041.pdfIn PDF document text
    • http://vadibun.pbworks.com/f/44455790463.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144436242/learn2serve_food_handler_training_course_test_answers.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144418371/difference_between_direct_method_and_grammar_translation_method.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/w/file/fetch/144441135/loremak.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144421224/magimediwewexomorofitanuk.pdfIn PDF document text
    • http://mibegenav.pbworks.com/f/what_foods_can_you_eat_on_the_grapefruit_diet.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144417126/download_game_sword_art_online_infinity_moment_english_patch_2.0.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/surah_yaseen_arabic_text_file.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_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 5460 bytes
SHA-256: bdc590283a45ccf396ddea0be4bf5190fac3ac362d1ef5ef8687c991613c6c73
font_01_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 10508 bytes
SHA-256: 0d52d044f5d1902f93a6d77b7affd53084786c23e60bed30685c8c714ce2e4e9

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