Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab58fafdb411f5ef…

MALICIOUS

PDF

71.2 KB Created: 2021-03-14 03:58:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fe326d634186b395d789365ef4849e82 SHA-1: 4fd7221e0ae60bf79d8d57ab02d73ec927ad799f SHA-256: ab58fafdb411f5efccb55080226948d2707b6a328f4aabc9a6678ab5de74413e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or domains with unknown reputations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, but the primary malicious activity is inferred from the URLs and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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=brass+birmingham+board+game+rules+pdf PDF link annotation
    • https://cdn.sqhk.co/vewukiziwemi/iJjhjjw/sitululotebewewimivikos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_5fdc6b3e73bf9.pdfIn PDF document text
    • http://wusazododapir.iblogger.org/fam_trip_report_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_601db5e57276e.pdfIn PDF document text
    • https://cdn.sqhk.co/liwewajawab/bAANidy/chum_earl_sweatshirt_piano_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5fd748d518502.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/zumulozugonawak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452865/normal_604955aa4aa2f.pdfIn PDF document text
    • http://zuduwamani.mypressonline.com/yamaha_01v96_audio_driver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462993/normal_600f4b9164de7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_6040ac4a2f0d6.pdfIn PDF document text
    • https://cdn.sqhk.co/pulurune/geYhhS8/italy_visa_application_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485157/normal_5fee061a341dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451742/normal_5fdff1262e785.pdfIn PDF document text
    • http://mopowataxix.medianewsonline.com/carte_du_monde__imprimer_format_a4.pdfIn PDF document text
    • http://jaxifas.getenjoyment.net/49025571704.pdfIn PDF document text
    • https://cdn.sqhk.co/fewukise/mijhehf/dashlane_password_manager_free.pdfIn PDF document text
    • http://kuvezowepo.scienceontheweb.net/google_books_url_to.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/rutufokedizon/what_is_site_reliability_engineering_google.pdfIn PDF document text
    • http://napepezubebefiw.epizy.com/biodiesel_startup_business_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/87009367267.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/wowaruvujewilawovimazew.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_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 5644 bytes
SHA-256: 87072233f82fdf999a82c5a0ee2af40342e96768ab6fb1eaecf6b09a3db81649
font_01_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 10120 bytes
SHA-256: 2f6872502842d679c2bbd52daa0377f6962211c1eb0a70bbec93442bc01811bc

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