Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ef6d830371d977…

MALICIOUS

PDF

85.5 KB Created: 2021-03-18 09:03:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3df0bf7d1a963c1968b35949a356fa46 SHA-1: 924240250b9737c5b457d34ddad7a7b2c11f744e SHA-256: 56ef6d830371d977126a4ea70a007896711c2183f176e87e98be5b6b25ba48ca
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 0.9998

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://fokemale.ru/wix?keyword=mspy+premium+apk+descargar PDF link annotation
    • http://tuderoba.getenjoyment.net/conexant_hd_audio_driver_windows_10_download_hp.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/hgjiGje/77269692352.pdfIn PDF document text
    • https://cdn.sqhk.co/sofawaju/idGPjb5/dazexa.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/jgplYjh/red_lobster_biscuits_to_go.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/hdgeX7N/snapchat_logo_png_black_and_white.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/what_is_in_jesus_name.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/hahgjfl/jefinedeta.pdfIn PDF document text
    • http://kodutizaga.mywebcommunity.org/pdf_ausfllen_und_speichern_freeware.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/76959286341.pdfIn PDF document text
    • http://tigibisolefora.mygamesonline.org/99803627505.pdfIn PDF document text
    • https://cdn.sqhk.co/merojuniv/hbFKEif/laser_cut_3d_models.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/phishing_training_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/dajupavepimoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4ad1fb-2ad0-48cb-be7d-41bb0eb21aa6/2599254228.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/free_antivirus_smadav_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/airport_authority_of_india_atc_answer_key.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_a45830d7096c45edac812a811e03eb6c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/simple_risk_management_plan_template_free.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_710fd99113b740808325695db2f66d92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c2d8a3-187e-4a95-9c14-8ae198f1b816/60431888441.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_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 5532 bytes
SHA-256: 300e59f6a8b49289da86a145dca9d94d32ceb9d7d2e3bc0f32ded4549efa7564
font_01_sfnt_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 11896 bytes
SHA-256: 3aea29be45de81936c2c38f569a71f931385ecbb39883375c4016a84054d47a1