Malicious PDF — malware analysis report

Static analysis result for SHA-256 680d8cf2179cc00a…

MALICIOUS

PDF

92.6 KB Created: 2021-05-01 23:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b8e7f9204d3ab6aae52171e305a239aa SHA-1: 0580658f2556a449be1da89c88e485683ef8e0f1 SHA-256: 680d8cf2179cc00aa52a83bf71dfdc2c53dbfcea02e18edd7d272b5e433f029b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains text related to 'vector addition', likely a lure to disguise the malicious intent of directing users to external sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=how+to+define+vector+addition+is+commutative PDF link annotation
    • http://emirofficialzm.com/casper_apk_latest_versionltzet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486374/normal_5fe819b1f1002.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/architecting_microsoft_azure_solutions_70_535.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369771/normal_5ff1ad3ac954b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_604db7c852f58.pdfIn PDF document text
    • http://esparks.ru/yusuke_confidant_guide_persona_5fx34s.pdfIn PDF document text
    • http://the-glow.ru/4235379028198lwy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421478/normal_6028e4cc49f42.pdfIn PDF document text
    • http://padojobimo.mywebcommunity.org/zifikolezuzizewusa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459464/normal_5ff9c4a5830fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kenukune.rf.gd/47325076531.pdfIn PDF document text
    • http://pumeluwona.epizy.com/accounting_month_end_checklist_template_excel_free.pdfIn PDF document text
    • http://kidogip.epizy.com/fibre_cement_roof_sheets_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7594d57a-d57f-4e9d-be55-4e2da91534cf/can_you_seal_mylar_bags_with_the_foodsaver.pdfIn PDF document text
    • http://wowijikozo.epizy.com/70930230735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f129bd06-fa81-4142-8c3a-a1224ecd9624/trane_xe90_high_limit_switch_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2711104-27f7-465c-9092-c8f4f3f45001/abu_garcia_black_max_or_pro_max.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b87d059-ad71-46cf-aed5-476ccf57ccd9/73008448779.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 5248 bytes
SHA-256: a132b7952a22e60276bca806cedd0c3d8ae59b3e606ae066fb64fbce3fc75b8f
font_01_sfnt_off00011fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 13076 bytes
SHA-256: f3e23c7cee0f89f0f601b20fd29c7eb0753d8f873929d31814bc79109848e19c
font_02_sfnt_off00014b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B79 16748 bytes
SHA-256: 5b1d3182685ce00a98e44f38053236eacb1ed286650bdcd9ba3e146efcadf9ed

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