Malicious PDF — malware analysis report

Static analysis result for SHA-256 5423e1e4bdcd2934…

MALICIOUS

PDF

78.0 KB Created: 2021-03-23 20:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59d25d17b02c11b60f5c9f0666c9fd53 SHA-1: efcbfa5b02dc8f5cc4640141f737bdd0f584f986 SHA-256: 5423e1e4bdcd2934784b60c56d34ff0af209b3e13ba5da0311e25a334be0671d
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 are to suspicious domains, indicating a link farm or distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious sites.

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://golowaki.ru/aws?utm_term=fallout+4+the+end+of+the+world+song+download
    • http://ovca.space/waxofatilovgruyy.pdf
    • http://nesobaka7.xyz/maax_spa_model_7816t5j0.pdf
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/953c2386.pdf
    • https://lapawiniposa.weebly.com/uploads/1/3/5/3/135323982/dusox.pdf
    • http://sigefolaxapuve.22web.org/financial_accounting_question_paper_2020.pdf
    • https://cdn.sqhk.co/xogudililavo/gfJhgid/sylvanas_windrunner_movie.pdf
    • http://realwockyc.info/repaboa3gze.pdf
    • https://cdn.sqhk.co/tixunadegu/micrmhI/tadamivogilaje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bekonoxidolu.rf.gd/fojid.pdf
    • http://lifanotuju.epizy.com/business_introduction_letter_sample.pdf
    • https://uploads.strikinglycdn.com/files/4f6d03df-5a6c-4840-bced-4c2d73a8e959/98390726677.pdf
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_2adbb58b7afe48f6b3daa253eb65fd2a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e38b895f-c40b-4594-b904-50c44e36736c/wukopimiwigudisegol.pdf
    • http://nimozan.epizy.com/power_bipolar_junction_transistor.pdf
    • http://fugewupije.rf.gd/ruwofon.pdf
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_ba650c64e457441b92d5377051af8add.pdf?index=true
    • https://e5aadbcf-511f-4ee2-989a-4410a22eeed0.filesusr.com/ugd/64930c_4e6595fb1fe14f179621611c795bb1cb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e747.bin
c00ed49815b1df6940315b3b6f429371e2f80ff068a38b3a636224d951abd5a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 5140 bytes
font_01_sfnt_off0000f8d3.bin
1c39cd99101b09f9e437e62512121477238d3de61909b78cf205ce5dba673a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 10516 bytes
font_02_sfnt_off00011c8f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 4324 bytes

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