Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa0f5d946794310…

MALICIOUS

PDF

81.4 KB Created: 2021-04-13 08:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ec480878b0999d381422363e9b23c33 SHA-1: 23f78e7d1471dd3c27d960dd6b5344f006331833 SHA-256: eaa0f5d946794310ec6a81e387331bc296bcb69944114311e0b3784a8818c7fa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV detection and ML classification strongly suggest malicious intent, specifically identified as a phishing trojan. The embedded URL `https://dafemum.ru/strik?utm_term=universal+audio+apollo+twin+vs+quad` is likely the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=universal+audio+apollo+twin+vs+quad
    • https://cdn-cms.f-static.net/uploads/4403806/normal_6010ad0a78078.pdf
    • https://cdn.sqhk.co/baxoladipezu/c5Ihhcl/followership_and_leadership.pdf
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/jiwuleteruli.pdf
    • https://fumirufax.weebly.com/uploads/1/3/1/8/131856188/pubeninifadadade.pdf
    • https://vokevifiv.weebly.com/uploads/1/3/4/6/134657891/jeputajirowub-polagul.pdf
    • https://fusewire.weebly.com/uploads/1/3/0/7/130776481/kutiduzajiviwog_kepevewasetezo_diburasepe_subukoparojimi.pdf
    • https://cdn.sqhk.co/dopebuxoz/gZSOgjp/gufolubujiviginujomosoxel.pdf
    • https://cdn.sqhk.co/xakalodesi/eWcAifs/hepatocellular_carcinoma_esmo-_esdo_clinical_practice_guidelines.pdf
    • https://pitulero.weebly.com/uploads/1/3/2/6/132683003/2e95b332.pdf
    • https://cdn.sqhk.co/genopeno/jbP8X9u/fapulidipadezox.pdf
    • https://duwaxitim.weebly.com/uploads/1/3/4/3/134312722/3388610.pdf
    • https://cdn-cms.f-static.net/uploads/4403141/normal_5fd798137e6f7.pdf
    • https://paxogusav.weebly.com/uploads/1/3/4/0/134040839/534d3fc6aff.pdf
    • https://liwotagavujid.weebly.com/uploads/1/3/5/9/135961529/24327f4bf.pdf
    • https://cdn.sqhk.co/xijogedobu/ehhGW7m/drinks_to_lose_belly_fat_in_2_weeks.pdf
    • https://cdn-cms.f-static.net/uploads/4412757/normal_5fe83f5789e08.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jevelel/30860205359.pdf
    • https://s3.amazonaws.com/panalipolifod/printable_skip_counting_worksheets_3rd_grade.pdf
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_0151267fa165490a926377a1fcce2101.pdf?index=true
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_9ebb02bd4b81483ea65719301dcdd895.pdf?index=true
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_0bf6687a6f3b4346b0ae93fe3a296aa4.pdf?index=true
    • https://s3.amazonaws.com/kosipefojaw/gridinsoft_anti-_malware_portable.pdf
    • https://s3.amazonaws.com/midipes/expanded_metal_sheet_solidworks.pdf
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_2caa7354be0845aeb865b3758886e190.pdf?index=true
    • 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_off00010007.bin
707e69e3182020c03df0094d6f977c935ad8ce3f80481e7b92113bea10f5e726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 5220 bytes
font_01_sfnt_off000111ef.bin
f266b56375441d8e3538f0d60daa06eca6606daf0bd0dedced7812dfa71acfbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 11112 bytes

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