Malicious PDF — malware analysis report

Static analysis result for SHA-256 0875595fa4ed14d4…

MALICIOUS

PDF

78.3 KB Created: 2021-03-31 21:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be9c7284c2f623f106b6e52ba0eca55a SHA-1: 71a72ca76bc97e743462e13e77a9b1621c4d70fc SHA-256: 0875595fa4ed14d4c0000e15a531f5b5624c7bb2c8c8d2c68aee7f6fac341cfc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious attempt to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a likely intent to download and execute further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=steel+pipe+fittings+melbourne
    • https://static.s123-cdn-static.com/uploads/4489257/normal_5ff5527f9ef5a.pdf
    • http://you-bestshop.xyz/why_is_my_kreepy_krauly_not_working2122x.pdf
    • https://cdn.sqhk.co/xusikeko/ihFggig/when_does_joplin_mall_open.pdf
    • http://app-3null.com/falolevadaruvozobaxavit2zon6.pdf
    • https://cdn.sqhk.co/podogule/UAgfvhb/vuvudexuzurapuwoti.pdf
    • https://cdn-cms.f-static.net/uploads/4413587/normal_601e67ace66ee.pdf
    • https://kogamawuxeg.weebly.com/uploads/1/3/4/5/134581879/zazugo.pdf
    • https://cdn.sqhk.co/remozemot/3gdjdLk/ladeneberaxuvez.pdf
    • http://smartcreditscore.info/canon_mp240_driver_win_10i906c.pdf
    • https://bumufufumobumag.weebly.com/uploads/1/3/2/8/132815806/9916483.pdf
    • http://reduslim-official.website/1793518656422a6m.pdf
    • https://wufijoduk.weebly.com/uploads/1/3/2/3/132302847/pamikufulovugi-topupufina-zewobas.pdf
    • https://gebonevoduxap.weebly.com/uploads/1/3/1/6/131606392/dizip_lafakila_nifudopu.pdf
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/5979765.pdf
    • http://ridunculus.com/viwol7cxtv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_63a1fb57083b45738ff56951bff13b82.pdf?index=true
    • http://fuzinokozekinuk.rf.gd/vibegujakafudisifagegi.pdf
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_647e89d0d3434c9f81449895fbf0029b.pdf?index=true
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_1aa310c0ae9d49e6ab24da34b4c3a8ad.pdf?index=true
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_b6fc409a704b441195d9abe3d87a5306.pdf?index=true
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_ae1739945b0e4d919de4ee12337496cc.pdf?index=true
    • http://sibazod.epizy.com/autodesk_sketchbook_pro_for_windows_7.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_off0000f5b2.bin
bc524946525e4077c7bccd74a0827b11ee2ebb55eca374eda57d2f79921a4e75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 5256 bytes
font_01_sfnt_off00010780.bin
881fb538af018816b909b9133609949264a17961ad9b96031b00f73e75de1b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 10764 bytes

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