Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d34b526b22b50d…

MALICIOUS

PDF

104.6 KB Created: 2021-05-28 12:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acec255855595e073b6ac6ad1e7ac26f SHA-1: cd65deac170a19963e44aaa30356d05aa7718c9f SHA-256: 47d34b526b22b50d7e2764ac9906289bbbfc847f0f227e413dd401e2fbea4510
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains a significant number of external links, suggesting a link farm or redirection mechanism to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/wb?keyword=what%20happened%20to%20the%20missing%20411
    • https://nofuzuvovakiba.weebly.com/uploads/1/3/1/3/131379181/7714a7756687c.pdf
    • https://badadivuzadan.weebly.com/uploads/1/3/4/5/134523039/2165305.pdf
    • https://nopogevoxipati.weebly.com/uploads/1/3/1/4/131410158/0de86616d80.pdf
    • https://cdn-cms.f-static.net/uploads/4421048/normal_602b2b9fc851c.pdf
    • https://nabumeludofava.weebly.com/uploads/1/3/4/3/134373896/cf397253340f.pdf
    • https://cdn-cms.f-static.net/uploads/4407997/normal_604fa37511148.pdf
    • https://gekuraneg.weebly.com/uploads/1/3/1/6/131637503/gorogetafune_waxajuzovofi_bujenemow_nafugeka.pdf
    • https://femadupimasimu.weebly.com/uploads/1/3/4/5/134594559/1816934.pdf
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/b58fdf.pdf
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/voriniv_jobetexaj_gexotuluvut_rapikipeb.pdf
    • https://bepewosub.weebly.com/uploads/1/3/4/4/134445398/5876250.pdf
    • https://cdn-cms.f-static.net/uploads/4381740/normal_6029a80dcd85e.pdf
    • https://kadukutinebi.weebly.com/uploads/1/3/4/7/134747046/penovuweb-salupewepeb.pdf
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/16e7a00ce86eb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c395ec4e-dc4d-4e9b-b7d5-ddd8e448869c/how_to_learn_calligraphy_app.pdf
    • https://uploads.strikinglycdn.com/files/0aae0040-a46c-468d-a96a-f5096d99d9db/vox_ac15c1_tube_layout.pdf
    • https://uploads.strikinglycdn.com/files/a41962a8-e99e-43c4-86f6-7c24d8a80197/1176424285.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b71.bin
76b040c705edc7d2f219ea3028c19579467be039335dfe5c3dbf4ea74555e4cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B71 5396 bytes
font_01_sfnt_off00016dc4.bin
07510ee49360e0d7173819e919bcbe49b51bd25554092db53eeb0ce10c663cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC4 11652 bytes

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