Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6bf9d649272f14…

MALICIOUS

PDF

77.1 KB Created: 2021-02-14 02:48:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 934d515de3c3e352bf439285dc441718 SHA-1: dfc3952c1f00982eb1d23d43e1306f9776d9babb SHA-256: af6bf9d649272f14a825f336dbadae17a4961688628d9dc0ace1a5b7dc11cbc1
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous external URIs pointing to disposable domains and link farms, suggesting a phishing or scam operation. The document body, though heavily obfuscated, appears to be a lure related to a 'Gratitude journal sheet', likely intended to trick users into visiting malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://seumenha.ru/wb?keyword=gratitude%20journal%20sheet PDF link annotation
    • https://cdn.sqhk.co/pugirunosamo/gfijfjg/62194916433.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/hiajic7/geviva.pdfIn PDF document text
    • https://tuvajidemagik.weebly.com/uploads/1/3/2/6/132681445/2826166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_6011895138d1e.pdfIn PDF document text
    • http://boevoenlp.com/434629705390gi81.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/wowaloretupiba_boxojurijiliv_rebamuxobojiwal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454184/normal_5fcdeb62ac427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_5fd668eb4d748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402740/normal_5fe8f675942ae.pdfIn PDF document text
    • http://tumbochka.space/campbell_ap_biology_11th_editionmblmt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462093/normal_5ff6c8e629f79.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/kejoregesiwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480895/normal_5fc7a1c882db9.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/jbFhjgq/best_customer_service_number_for_irs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_5fe8dd4cea39d.pdfIn PDF document text
    • https://mujunuduxur.weebly.com/uploads/1/3/5/3/135327440/jeguguwolopu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wavedada.epizy.com/android_snackbar_with_button.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_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 5020 bytes
SHA-256: 68f364acf87782f6533a2f2eb4400c86468e880ecd0b931be505ed94b58e6989
font_01_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 10700 bytes
SHA-256: fc2630e2d6b72a17e7b43300aa6e0b4a77bf57923d3008a8854b172f899a1ae0

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