Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa0576f654e7b21…

MALICIOUS

PDF

78.8 KB Created: 2021-03-30 20:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 48ac91f72e123068c92f0d728cce7dc7 SHA-1: 9be5f8fa9973d10068b03e41c64251000723d5a1 SHA-256: baa0576f654e7b2122cf8f13c6d01ffd2c5a647a852ec8560f507fc8df7c7ee0
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 0.9992

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://zajinet.ru/wix?keyword=20th+ward+chicago+map PDF link annotation
    • https://cdn.sqhk.co/jotoselu/v6Xjdgg/youtube_for_android_tv_apk_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/R3YvGtP/pozodemevijexis.pdfIn PDF document text
    • https://cdn.sqhk.co/rovukupovumo/ehhlFBs/contract_assassin_hitman.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/xsghChe/gnuplot_line_color_list.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/98741535838.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/pijax.pdfIn PDF document text
    • https://cdn.sqhk.co/kizajituxab/AZbidic/colour_by_number_worksheets_christmas.pdfIn PDF document text
    • https://zuwiwenulabir.weebly.com/uploads/1/3/1/3/131381762/683105.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/jczohdJ/550_parachute_cord_1000_ft.pdfIn PDF document text
    • https://cdn.sqhk.co/leguzufaju/Ligifjb/fopakepikox.pdfIn PDF document text
    • https://cdn.sqhk.co/pamezuravuno/ggcvQhi/powupis.pdfIn PDF document text
    • https://cdn.sqhk.co/panazomuv/h0Vnjbs/lowes_printable_coupons_august_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/webunojixisa/jeh3hjZ/yellow_facebook_messenger_icon.pdfIn PDF document text
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/vamibu.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/icifijb/cnbc_live_audio.pdfIn PDF document text
    • https://cdn.sqhk.co/lasokixon/1ifTib9/nawuz.pdfIn PDF document text
    • http://kovafuwir.getenjoyment.net/active_directory_tutorial_for_beginners.pdfIn PDF document text
    • https://sisilodoja.weebly.com/uploads/1/3/1/4/131406442/bedonovimo.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/51101191138.pdfIn PDF document text
    • https://cdn.sqhk.co/doginifa/3iehgjj/673862579.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/A5iiLif/50591077311.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rewokop.epizy.com/bewebufopadinuzufer.pdfIn PDF document text
    • http://mukagodikuve.rf.gd/pdf_file_link_wordpress.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_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 5548 bytes
SHA-256: af7f4a2c2241a069bdb8a6484ba6b4781b7a0f2c631af1f975e44881f61d02bf
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 10564 bytes
SHA-256: d474936d761afaa2637b8e4798dc741580806547302170b1a5f67dc00848eee2

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