Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf0bcfb1eb75194…

MALICIOUS

PDF

84.2 KB Created: 2021-03-19 09:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0eec2abcfa7ffc2f7dbc86b85d5ca096 SHA-1: 8ff07471a91520ed9195ac81ec4349d27b67c3f2 SHA-256: bbf0bcfb1eb75194bd6a531cfca1ca6e0624ded9f9b0f0e143c26f0097bda065
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9991

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://nipisod.ru/award?keyword=tamil+language+learning+pdf+free+download PDF link annotation
    • https://lelobetiladafan.weebly.com/uploads/1/3/4/4/134497055/wenigep-gukajelis.pdfIn PDF document text
    • https://fatibetoliwan.weebly.com/uploads/1/3/4/7/134731660/9102675.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/29347346221.pdfIn PDF document text
    • https://fozonened.weebly.com/uploads/1/3/5/3/135326763/varilu-tewip.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/0562be70-c3b5-4ae9-a3cd-ed6b0f6e6723/math_puzzles_with_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2949cb49-5a2d-4000-bcee-91b0aa1fd248/morufigapor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/365b9ab6-51ac-4eb7-b73e-254bd4cfe079/maschine_mikro_mk2_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/moxem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed0bd6f-d68b-4178-ac6a-4ec548b5910a/dyson_dc44_animal_stopped_working.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/socio-cultural_environment_meaning.pdfIn PDF document text
    • http://viwuwijagabote.myartsonline.com/xelikazamavabenet.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/angularjs_7_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927d6fc6-c1cd-4873-83f1-0b4bca43cf48/vofifuturufubagito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe81725-066b-4d6c-900d-e261f6790e87/vamemuvuworadul.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/chennai_express_tamil_movie_in_tamilyogi.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/why_is_my_computer_not_charging_while_plugged_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21523c59-4224-49d1-808a-374e56140791/rosaxajifi.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/99852756618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc0f01e9-e5e6-4577-b722-f43c30ba46dd/petsafe_wireless_fence_replacement_collar_strap.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/how_many_human_trafficking_victims_in_the_us.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/8822280409.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/movies_time_apk_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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 5224 bytes
SHA-256: f85bb32641ccb4c50b312796b7c204a9e77100de5d22fd0c28e48a75517d00b6
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 4212 bytes
SHA-256: aac26d862dddd1b23ca15c4eefc246f98609e86dfe6292e17d5d3a48237d9498
font_02_sfnt_off00010883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10883 10836 bytes
SHA-256: 604048fc944f26d87ed81da03ca1bb153880495bb4aac3a9c110210d67ad412f
font_03_sfnt_off00012dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC6 16068 bytes
SHA-256: 912e8c3c37b183d760f7f382ef110bdca05c7793b62d2efdd5772423ec248018

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