Malicious PDF — malware analysis report

Static analysis result for SHA-256 867cde6adf791790…

MALICIOUS

PDF

83.9 KB Created: 2021-02-18 10:22:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cf551e3745f2f1acd663e8b768d0cdea SHA-1: 89434ec09ca77079d3454a15999ece4d67857759 SHA-256: 867cde6adf7917906999a97bf30bfe19612ff170d200319d399e474409598cef
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external URLs, many hosted on disposable domains or link shorteners, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection further supports its malicious nature. No scripts were extracted, but the structure indicates a phishing or malware distribution lure.

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://druttle.ru/123?utm_term=ridgid+6+gallon+air+compressor+parts PDF link annotation
    • https://cdn.sqhk.co/moxinivo/giibggJ/download_cyberfoot_2020_mod_apk.pdfIn PDF document text
    • http://fomuvegikutidob.iblogger.org/what_is_enlightenment_kant_summary_sparknotes.pdfIn PDF document text
    • http://busevabafumoje.iblogger.org/everyday_use_selection_quiz_answers.pdfIn PDF document text
    • http://madusotiju.22web.org/cisco_system_vpn_client_windows_10.pdfIn PDF document text
    • http://instasale.company/bise_sukkur_board_9th_result_2019_downloadv8xgj.pdfIn PDF document text
    • https://gipenozup.weebly.com/uploads/1/3/1/0/131070487/2951659.pdfIn PDF document text
    • http://tcerkovniekupola.space/711650503900snvi.pdfIn PDF document text
    • https://cdn.sqhk.co/xafukapewe/eIKibng/48230345685.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/gchbjaM/34720848295.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/ijgigfk/qr_and_barcode_scanner_android_github.pdfIn PDF document text
    • http://vnds-super.space/nibepuxopiwt13d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xupikilagi.rf.gd/dajugu.pdfIn PDF document text
    • http://tubiruk.epizy.com/apply_for_nz_passport_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/bituxesojuxobux.pdfIn PDF document text
    • http://lejubegow.epizy.com/vobazizebozujatomidu.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_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 5556 bytes
SHA-256: 618403aa2eb6ed483287529bcce3c8f80a39799e7210e2a0f252ee8da2be97d4
font_01_sfnt_off00011afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 11532 bytes
SHA-256: f4a7e338e80da1ab216cb65b4ef4014ac86c6ef2e54bf5694177d3f8f9f236f5

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