Malicious PDF — malware analysis report

Static analysis result for SHA-256 889ac75786706737…

MALICIOUS

PDF

79.4 KB Created: 2021-04-03 14:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bd2cea08c096e383a749138a3584e2a3 SHA-1: 5b02f9dc9b1a6062d77c94fdd5abfa9a9ffb2f5a SHA-256: 889ac757867067373bbad06a38b9aae08f29d4990949ea5b7cb967fab103b40c
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The presence of URLs like 'nipisod.ru' and 'kalukoroduro.mygamesonline.org' suggests an attempt to direct users to potentially malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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/wix?keyword=kingoroot+apk+download+6.0+1 PDF link annotation
    • http://kalukoroduro.mygamesonline.org/gpsc_calendar_2020_19_download.pdfIn PDF document text
    • http://bomisedoxu.mywebcommunity.org/wigozogu.pdfIn PDF document text
    • http://arnautmebel.ru/jitofexexee00x4.pdfIn PDF document text
    • http://hookup671.site/animal_farm_online_book_chapter_36ls09.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/Fjchhhe/dinoland_usa_games.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/azBgduk/v_moda_m200_head_fi.pdfIn PDF document text
    • http://sakaxek.mygamesonline.org/tripadvisor_certificate_of_excellence_2020.pdfIn PDF document text
    • http://nukicew.xyz/pelufikokuditotnor3.pdfIn PDF document text
    • http://1pokypki.website/no_game_no_life_novel_englishqgsdz.pdfIn PDF document text
    • http://xanejog.medianewsonline.com/why_is_my_ninja_blender_flashing_red.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_639df6d51acc4276a9fc0e3c7da5424c.pdf?index=trueIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_dc6c9daa738a4580a30ba8cc0f908afb.pdf?index=trueIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_d4bf78a0281f430d8364bd539d503540.pdf?index=trueIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_3e43068c497c4ddca803011c7984fda6.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_f3050603d0ae42c2be64dafe1bb08e12.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_fa544e2c95614be9bba7c7b154ec75ea.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_e01af6c5c03a4120ae6eb74b0d89922c.pdf?index=trueIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_b0e4fd47106f44589ad77012de6ec9c5.pdf?index=trueIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_eeb905583cb5409e81a3cf3939f9ed68.pdf?index=trueIn PDF document text
    • https://b1394492-4877-47b1-8bf2-e962974baa99.filesusr.com/ugd/3e4b7a_82c82e8e41a543c4a3807dbe3b25e967.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_7b4f5bf11e3b4bc29a9fac997ab03bf9.pdf?index=trueIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_6c39d79e8cdf42d7986132ac52235442.pdf?index=trueIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_059345b3e51145b7a0864b0289926ae5.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_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 5456 bytes
SHA-256: 11d9fb9116dc472ba351f32f413872c6f65b0fd2688e1d5e1230d1f146afcd67
font_01_sfnt_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 11832 bytes
SHA-256: 8421bb00fce4ae935e9aeb5db22369a2ab4d382aafd5b27fde928f5825c28c5d

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