Malicious PDF — malware analysis report

Static analysis result for SHA-256 3825fb50c29e3f7a…

MALICIOUS

PDF

75.8 KB Created: 2021-05-16 23:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f75333f82e0cd6f83aeba2f303ce6829 SHA-1: 3e53101707876e071f05ef1461b8cef931ecd638 SHA-256: 3825fb50c29e3f7a7a26153e378576b7dd560e80d779bab0ab2792ab0b7de74a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a search query. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+describe+lover+in+one+word In PDF document text
    • http://arnautmebel.ru/leo_tolstoy_emperors_three_questionsjnsbi.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/higgAic/965456109.pdfIn PDF document text
    • http://dalnoboyi.xyz/59404178017bz6x6.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/h8bhaXE/wakesogusa.pdfIn PDF document text
    • http://psychologyrelax.xyz/revealing_the_mysteries_of_heavenc67ze.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/ahcYggJ/how_to_be_a_certified_teacher_in_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/bhbid1f/poe_elementalist_build_3._12.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/ic2jfMx/35888069770.pdfIn PDF document text
    • http://wrestling-mma.com/gobuxamevabivorawofvqvm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/figidireki/clostridium_difficile_colitis_treatment_guidelines.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_7325490a85324bcf9c3cb3ecbc626f07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvazi/6630660525.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/zejowogigepewimexiweko.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_a456f89a3c834cb1aef65ab0dfcf4afe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/febopa/harley_davidson_iron_883_maintenance_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/asure_id_7_with_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/scientist_coldplay_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/bavoruzawo.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/runescape_artisan_workshop_respect_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/quadrilateral_interior_angles_worksheet.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_off0000ea4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 4976 bytes
SHA-256: f0b7fec3e3b7dab5ef90ecd7c474ac8600f80e665a39057b158f9ee5612fe8c5
font_01_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 10908 bytes
SHA-256: 2be0836ef73aeb8f4e747bb3b9f697b6712d888d93bac7908ba2baf78f73a6ac

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