Malicious PDF — malware analysis report

Static analysis result for SHA-256 76521366960fe3a7…

MALICIOUS

PDF

83.2 KB Created: 2021-03-18 09:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8c1bff63ab594a7481cff884cef8cee7 SHA-1: 2daafab33ea581d11aaebd1f65652ab680683c43 SHA-256: 76521366960fe3a78ee9afa01809e310f7e9caaa5afc6c532472b1c7df0ae54f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is identified as a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification confirm its malicious nature. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, indicating it was likely generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=what+does+keal+mean+forged+in+fire PDF link annotation
    • http://zadakob.22web.org/aprendizaje_social_autores.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/3kjjALa/trial_balance_example_accounting_coach.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/jghbidy/words_that_start_with_v_for_toddler.pdfIn PDF document text
    • http://wameduxuka.iblogger.org/43795697542.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/gcjfjbB/dijilokokerodazogakeza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_bfe9584ba1b44a8584a5ace2c1d3d4db.pdf?index=trueIn PDF document text
    • http://zigetolerup.epizy.com/tizubokevezofuvaxi.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_d08d34dce51749d0b23dd6c93b3dcb00.pdf?index=trueIn PDF document text
    • http://dekegafazuwad.rf.gd/malayalam_bible_stories_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6e9643-256c-4a7d-9f3f-e55249f68c12/53487410221.pdfIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_fd7d6cfa56dd41de824d2e0e7cbc3aa7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f34031f-0dc9-4392-ac4c-1c9a2c1efd07/47831357823.pdfIn PDF document text
    • http://muduwabu.rf.gd/sigidifebunasisilelo.pdfIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_e7220c2791fd4efbad7d9df6b34494fa.pdf?index=trueIn PDF document text
    • http://ratadipemor.epizy.com/5896598417.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_6fcc8c8a771d486384f2e101deb5770c.pdf?index=trueIn PDF document text
    • http://tifoxirekurox.epizy.com/dnd_character_sheet_online.pdfIn PDF document text
    • http://mujelagikajuju.rf.gd/jiviv.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_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 5400 bytes
SHA-256: 5004631b793fac417257032a7a67751b10b50312c81b8e3c95f47f9d5513a9d6
font_01_sfnt_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 11304 bytes
SHA-256: d09e4eac9aab80bf0b4be4c59ba7a960ee6908a80d6f8136a273a6da08c45f12

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