Malicious PDF — malware analysis report

Static analysis result for SHA-256 e798b0ef3484178b…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 09:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b66731530d96e194a52799cff0dff83b SHA-1: 037cdbef24bce70f4f7c3b114cfb5546f99bf2cc SHA-256: e798b0ef3484178b4e15a262910697cbd7bc1160ec007a3f5523fb1c8eb7b90e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the purpose is to host numerous files, likely for SEO poisoning or to distribute further malicious content. The ML classifier and ClamAV detection confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://autosoftware.company/autoresponders_images/files/fatibe.pdf In PDF document text
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/mefegodiwejajotabefa.pdfIn PDF document text
    • https://zarrue.com/app/media/images_description/files/tanojo.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/24894999009.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021092413093280554.pdfIn PDF document text
    • https://mikludava.lt/images/files/juvewekedodisokidavabi.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/dunuvitekavizoxefazinam.pdfIn PDF document text
    • https://shunnasato.com/82900284285.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/35866132235.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/95599032822.pdfIn PDF document text
    • https://fond.ru/userfiles/file/77324964322.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/81171883486.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/32578085469.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/zenowixivarogowomewize.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/58517797796.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/nasubijokibiwo.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/konuvanejewazodix.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/21816518951.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/sadaxazi.pdfIn PDF document text
    • https://norservis.cz/files/files/19388489321.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/13091368954.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/nefuzaferumevo.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/lejirorafika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=thoptv+cricket+live+apk+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AB 10652 bytes
SHA-256: a7a7580939d83359d995fb57417b071b297e3cbb519ce9e4c02bc383e64dea96
font_02_sfnt_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 15484 bytes
SHA-256: b189e594b5ee7f9b8cb701109d97b0b1731faa5c002ed5d00a5160363341ca12

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