Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27eb90a6efe19a4…

MALICIOUS

PDF

74.4 KB Created: 2021-03-14 11:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d7850a713690e1cf01891092cc94fec SHA-1: b256879184da013fa6ca1a2f3779bf2a615b5d06 SHA-256: c27eb90a6efe19a49803f3d7a847ef21b5c387ec95ce3b4b4ca308c91d1c6acf
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://leonvi.ru/wix?keyword=textnow+apk+old+version+2019', suggesting a lure for potentially malicious content or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://leonvi.ru/wix?keyword=textnow+apk+old+version+2019
    • https://static.s123-cdn-static.com/uploads/4407733/normal_600274e9c880b.pdf
    • http://vewisono.iblogger.org/23797816620.pdf
    • https://mekiwukokoviv.weebly.com/uploads/1/3/4/8/134867966/kizegukaxabazol.pdf
    • https://cdn-cms.f-static.net/uploads/4477387/normal_6010b690115b1.pdf
    • https://cdn-cms.f-static.net/uploads/4478134/normal_604da51b5b912.pdf
    • https://vusuvorolom.weebly.com/uploads/1/3/4/5/134501440/6761313.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fulosobezur/film_bodyguard_netflix.pdf
    • https://s3.amazonaws.com/zidenigad/potan.pdf
    • http://mapegolirij.epizy.com/kegadidepezene.pdf
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_73785b56187e4b27bacfecd22298f122.pdf?index=true
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_1e4575baecb945128c5259cbdfcd2948.pdf?index=true
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_93b8024e8cee493585773cfd2df5e045.pdf?index=true
    • https://s3.amazonaws.com/dipafuxe/vuvesutev.pdf
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_773b831c2d0143e9a496d87f7fb0ddec.pdf?index=true
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_273334408d5747bbaf820235b5a87e11.pdf?index=true
    • https://s3.amazonaws.com/xeroguru/what_is_tqm_example.pdf
    • http://jivinogitejif.epizy.com/2013_dodge_avenger_oil_change_interval.pdf
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_e054a935c0494696ab4bcd1bb98d0318.pdf?index=true
    • https://s3.amazonaws.com/kevava/ridoxuteruna.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_off0000e333.bin
c2204a272a7f002bb68175cae3aaea699085edd298482f3df40297db11c1b2e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 5668 bytes
font_01_sfnt_off0000f6ac.bin
49154386d00440f9ffd4e95a654d64f7ece817421a5eaf3ba2c713afb8f61681		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 11252 bytes

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