Malicious PDF — malware analysis report

Static analysis result for SHA-256 8584bb8ed338cb39…

MALICIOUS

PDF

82.8 KB Created: 2021-06-01 19:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 70544c16320ade34281bcfc544c92dec SHA-1: b08575cff310f74adeb67b6946f60ad51f7c1341 SHA-256: 8584bb8ed338cb3989d19ab72b33d598837cb1b5a0ccf9ef01f85044b4600669
186 Risk Score

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-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://cructi.ru/pbw?utm_term=intensive+and+reflexive+pronouns+worksheets+with+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383128/normal_6043b51ca1ac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_606e65c596c95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477173/normal_5fe79f851b930.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378164/normal_5fc7ff5a3d813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_605834d3d210f.pdfIn PDF document text
    • https://dovesexafonom.weebly.com/uploads/1/3/4/7/134702519/ripogi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419640/normal_5ffe85f7c36d5.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/bf31cd2795579.pdfIn PDF document text
    • https://towowiwegopute.weebly.com/uploads/1/3/4/0/134019464/d408f.pdfIn PDF document text
    • https://pibowalemarume.weebly.com/uploads/1/3/1/1/131164440/808573c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_5fec021102830.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379384/normal_60051514c6a3e.pdfIn PDF document text
    • https://nagozexifetuli.weebly.com/uploads/1/3/4/3/134340384/65ae47e91f311.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jotoxipigi.pbworks.com/f/makejepugoniderirajasadiz.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/w/file/fetch/144468399/how_to_access_menu_on_vizio_tv_without_remote.pdfIn PDF document text
    • http://gufabewa.pbworks.com/f/how_long_does_myofascial_pain_last.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/sea_of_thieves_mobile_game_download_for_android.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/f/1773150487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32264aa-bc15-41ad-a890-40cb971d73de/how_to_prepare_formula_milk_for_1_month_old_baby.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de26810-d859-408c-8e4b-55da585d8d9f/longman_anthology_of_world_literature_2nd_edition_volumes_a-c.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144446580/tubidy_mp3_mzik_indirme_program_indir_cretsiz.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144449493/78950570582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ac1e108-1f83-46a7-8fe7-e9dd923e8baf/85991063902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb76a31c-33f6-4fa5-b494-f6347fd3b8e0/demexaligobomipav.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_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 5452 bytes
SHA-256: 448b54b12e9088a7c741eec5fac42f2ff1cb4e01bd4ffde477b08affc687acc3
font_01_sfnt_off00011417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 12288 bytes
SHA-256: 1fd83630e7c71d5ae17df693e3a432ecd023bdca4f5cd53964df29e8c8491758