Malicious PDF — malware analysis report

Static analysis result for SHA-256 f966bf6935041f0b…

MALICIOUS

PDF

89.9 KB Created: 2021-04-04 07:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4109702e14c18c05400e33ee8a7cef90 SHA-1: 20df388c8f858d0350b1d82ee6f2711ddd3f1baa SHA-256: f966bf6935041f0b4a75257eb1d0a40f5097b7fc9b8d3083965b86b8630b72dd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to reference an Arris modem manual, likely a lure to direct users to malicious sites.

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://gimoguvi.ru/strik?utm_term=arris+modem+tg852g+manual PDF link annotation
    • https://cdn.sqhk.co/lobinazema/iihjibn/10937308874.pdfIn PDF document text
    • http://lawyer-consult.ru/82676448765s2ek1.pdfIn PDF document text
    • http://biweekamnf.com/php_website_templates_with_admin_panel_free8w5jd.pdfIn PDF document text
    • http://fasad-dom.site/ufc_tonight_channelw5sxg.pdfIn PDF document text
    • http://hookup757.fun/movugabomugupqxzq2.pdfIn PDF document text
    • http://pidijajuwupurop.medianewsonline.com/everytime_britney_spears_sheet_music.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/pedufoxogizinakebatol.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/how_to_reset_skyscan_atomic_clock_86722.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/gfWgjjf/5078895723.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/gj3Dwjg/bounce_back_loan_lloyds.pdfIn PDF document text
    • http://blaugrana.ru/xixevurefomavodopi1ozpa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_cc51f66354c0499594e545bcbc021cbe.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_8072ea692c7047d3a4ff8a6049ecd83b.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_825831d5449c447c84154a4e9e93ea62.pdf?index=trueIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_99632396892442758549e690df7f57cb.pdf?index=trueIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_4224ca05acc846b8a78924b78759aeb8.pdf?index=trueIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_375fa5d43dcb4daaac7b79a9d08e7b71.pdf?index=trueIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_800ef918bb994a0d812ed56a7e8efca7.pdf?index=trueIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_3174ea36194b49dbae345a9883d74ec3.pdf?index=trueIn PDF document text
    • http://sagoralezerelo.onlinewebshop.net/tewarunebut.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_592eb72816d14cd6a6a1349670e65c61.pdf?index=trueIn PDF document text
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_f7d7390c6a8c470a94367bd6efeed961.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_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 5584 bytes
SHA-256: abce1fbc14616d34af54ae9dd070e09b1aadfb4c97203ef1c1a51f0ae9139986
font_01_sfnt_off00013067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13067 12616 bytes
SHA-256: d4a9e537f824ad24075828aa87034e8bd7f54c1b1ab10036e1bb0ec460712082