Malicious PDF — malware analysis report

Static analysis result for SHA-256 787ca145e33ee172…

MALICIOUS

PDF

81.9 KB Created: 2021-03-29 16:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e848feca784fef33edf109bb533775b9 SHA-1: f533bfc5c0a265d2aea71eca90d8dc888e44b773 SHA-256: 787ca145e33ee172842ea79977d6c8da776b8711f5f65654252bfd908e8d0713
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 0.9996

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://mezovuduw.ru/123?utm_term=tunnel+boring+machine+operation+manual PDF link annotation
    • https://tafibukazun.weebly.com/uploads/1/3/5/4/135400045/miseb_judepobovabap.pdfIn PDF document text
    • http://iwhite.space/mulodovemakulidenewixafatnwte.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366984/normal_6001d5c53da64.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/6946074.pdfIn PDF document text
    • https://xupovefodifej.weebly.com/uploads/1/3/6/0/136053951/817308.pdfIn PDF document text
    • http://vkysnaya-eda.site/864686088830gb21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_601cf2663a605.pdfIn PDF document text
    • http://help-service-support.com/types_of_gears_and_its_application5hjkz.pdfIn PDF document text
    • http://poverkavoda.website/62479955250qrkzw.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/9jjFjg3/fps._io_fast-_play_shooter.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/gtkToih/marlboro_ice_blast_carton_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/puruwedisuma/9kjjmZE/cookie_clicker_hack_ios_download.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/idiots_guide_to_ayurveda_barnes_and_noble71pea.pdfIn PDF document text
    • https://nusewumu.weebly.com/uploads/1/3/2/7/132740482/3409962.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/3139895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_6023d15902dee.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisezepemu/yEhi3Af/dogfights_history_channel_episodes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366660/normal_5fe3860d48395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_c63352e92efd46ccbf66e7635e5bdd76.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_149ccaf296a141469de585a9eaa03b45.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_21cafb28b4984a23ae0c26319a81e38f.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_053c9a13bf21467598cc3777deb7c31d.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_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 5256 bytes
SHA-256: f7138a41a99754abc11f4938b541a8070e3a8f9d0770a7728761d0211606992a
font_01_sfnt_off0001127b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127B 12468 bytes
SHA-256: 6b9cfec4d73c5f853b54f08ec839b5207d0c99eb76ecb9de36415fa9fe058d9d